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All questions of May Week 2 for NEET Exam
Autotrophic thallophytes are called as :-- a)Fungi
- b)Lichens
- c)Algae
- d)Microbes
Correct answer is option 'C'. Can you explain this answer?
Autotrophic thallophytes are called as :-
a)
Fungi
b)
Lichens
c)
Algae
d)
Microbes
|
Anjali Iyer answered |
Plants that do not have well-differentiated body design fall in this group. They are commonly called algae. Algae are chlorophyll-bearing, simple, thalloid, autotrophic and largely aquatic (both fresh water and marine) organisms.
Thallus = a plant body not differentiated into stem, leaves, and roots and without a vascular system, typical of algae, fungi, lichens, and some liverworts.
"Red rust of tea" is caused by parasitic:-- a)Algae
- b)Fungi
- c)Bacteria
- d)Bryophyta
Correct answer is option 'A'. Can you explain this answer?
"Red rust of tea" is caused by parasitic:-
a)
Algae
b)
Fungi
c)
Bacteria
d)
Bryophyta
|
Priya Patel answered |
Parasitic green alga which causes the disease 'red rust of tea' in tea plants and 'leaf spot disease of guava' in gauava plant. It also causes leaf spot diseases in other plants like mango, magnolia and coffee.
Carpogonia is the female sex organ in which of the algae?- a)Chlorophycophyta
- b)Xanthophycophyta
- c)Chrysophycophyta
- d)Rhodophycophyta
Correct answer is option 'D'. Can you explain this answer?
Carpogonia is the female sex organ in which of the algae?
a)
Chlorophycophyta
b)
Xanthophycophyta
c)
Chrysophycophyta
d)
Rhodophycophyta
|
Akash Nair answered |
The correct answer is option D, Rhodophycophyta.
Rhodophycophyta, also known as red algae, is a diverse group of algae that includes thousands of species. They are primarily marine organisms and are found in a variety of habitats ranging from tropical to polar regions.
Female Sex Organ in Red Algae:
The female sex organ in red algae is called carpogonium. It is a specialized structure that is involved in sexual reproduction. The carpogonium is a multicellular structure that is found in the reproductive structures of red algae.
Structure of Carpogonium:
The carpogonium consists of a swollen base that contains a single nucleus and a long, hair-like projection called the trichogyne. The trichogyne is used to capture sperm cells during sexual reproduction.
Function of Carpogonium:
During sexual reproduction in red algae, the carpogonium acts as the female sex organ. It is the site of fertilization and the development of the zygote. The trichogyne of the carpogonium captures sperm cells released from the male sex organ, called spermatangia. The sperm cell then fuses with the nucleus of the carpogonium, leading to the formation of a zygote. The zygote develops into a diploid sporophyte, which produces spores that can germinate into new individuals.
Conclusion:
In conclusion, the carpogonium is the female sex organ in red algae. It is a specialized structure that plays a key role in sexual reproduction by capturing sperm cells and facilitating the fusion of gametes.
Rhodophycophyta, also known as red algae, is a diverse group of algae that includes thousands of species. They are primarily marine organisms and are found in a variety of habitats ranging from tropical to polar regions.
Female Sex Organ in Red Algae:
The female sex organ in red algae is called carpogonium. It is a specialized structure that is involved in sexual reproduction. The carpogonium is a multicellular structure that is found in the reproductive structures of red algae.
Structure of Carpogonium:
The carpogonium consists of a swollen base that contains a single nucleus and a long, hair-like projection called the trichogyne. The trichogyne is used to capture sperm cells during sexual reproduction.
Function of Carpogonium:
During sexual reproduction in red algae, the carpogonium acts as the female sex organ. It is the site of fertilization and the development of the zygote. The trichogyne of the carpogonium captures sperm cells released from the male sex organ, called spermatangia. The sperm cell then fuses with the nucleus of the carpogonium, leading to the formation of a zygote. The zygote develops into a diploid sporophyte, which produces spores that can germinate into new individuals.
Conclusion:
In conclusion, the carpogonium is the female sex organ in red algae. It is a specialized structure that plays a key role in sexual reproduction by capturing sperm cells and facilitating the fusion of gametes.
Stone wort is common name of :–- a)Chara
- b)Chlorella
- c)Laminaria
- d)Polysiphonia
Correct answer is option 'A'. Can you explain this answer?
Stone wort is common name of :–
a)
Chara
b)
Chlorella
c)
Laminaria
d)
Polysiphonia
|
|
Pooja Mehta answered |
Stonewort The common name for the brittle, calcified plants of the Charophyta; Chara and Nitella are the commonest British genera. The plant consists of a ‘stem’ or axis which bears whorls of branches at intervals (nodes) along its length. The axis is attached at its base to the substratum by means of branched rhizoids.
Plants which are not differentiated into roots, stem and leaves are grouped under- a)Gymnosperms
- b)Pteridophytes
- c)Thallophytes
- d)Spermatophytes
Correct answer is option 'C'. Can you explain this answer?
Plants which are not differentiated into roots, stem and leaves are grouped under
a)
Gymnosperms
b)
Pteridophytes
c)
Thallophytes
d)
Spermatophytes
|
|
Wahid Khan answered |
Thallophyta is that phylum of plant in which the thallus(body) is not differentiated into leaves, or stem, etc. They do not have a vascular bundles also.
Sexual reproduction in Thallophyta takes place by:-- a)Isogamy
- b)Anisogamy
- c)Oogamy
- d)Any of the above
Correct answer is option 'D'. Can you explain this answer?
Sexual reproduction in Thallophyta takes place by:-
a)
Isogamy
b)
Anisogamy
c)
Oogamy
d)
Any of the above
|
|
Preeti Iyer answered |
- Thallophyta reproduce sexually when gametes fuse to form a zygote.
- There are three types of sexual reproduction on the morphological and physiological behavior gametes.
- Isogamous: both the gametes are morphologically and physiologically similar and their fusion is called as isogamy.
- Anisogamous: The microgamete is smaller and more active, whereas the female gamete is larger and sluggish and their fusion is called as anisogamy.
- Oogamous: female gamete is large and nonmotile and male gamete is small and motile and their fusion is called as oogamy.
Thus, the correct and answer is option D.
Vectors can be added by- a)adding the magnitudes of the vectors
- b)adding the angles of the vectors
- c)translating the two vectors
- d)parallelogram law of addition
Correct answer is option 'D'. Can you explain this answer?
Vectors can be added by
a)
adding the magnitudes of the vectors
b)
adding the angles of the vectors
c)
translating the two vectors
d)
parallelogram law of addition
|
Puja Kaur answered |
Explanation:Parallelogram law of vector addition is,If two vectors are considered to be the adjacent sides of a Parallelogram, then the resultant of two vectors is given by the vector which is a diagonal passing through the point of contact of two vectors.
Photosynthetic pigments common to all algae :-- a)Chlorophyll 'b' and carotene
- b)Chlorophyll 'a' and 'b'
- c)Chlorophyll 'a' and carotene
- d)Chlorophyll and xanthophyll
Correct answer is option 'C'. Can you explain this answer?
Photosynthetic pigments common to all algae :-
a)
Chlorophyll 'b' and carotene
b)
Chlorophyll 'a' and 'b'
c)
Chlorophyll 'a' and carotene
d)
Chlorophyll and xanthophyll
|
Rohit Shah answered |
These chlorophyll types are not common to all the algae. All algae and plants possess one or more kinds of carotenoid pigments. Carotenoids collectively include the hydrocarbon carotenes (for example, beta carotene, ) and their hydroxyl derivatives, the xanthophylls.
Phycobilins are characteristic pigments of :-- a)Rhodophyta and Xanthophyta
- b)Rhodophyta and Pyrophyta
- c)Pyrophyta and Cyanophyta
- d) Cyanobacteria and Rhodophyta
Correct answer is option 'D'. Can you explain this answer?
Phycobilins are characteristic pigments of :-
a)
Rhodophyta and Xanthophyta
b)
Rhodophyta and Pyrophyta
c)
Pyrophyta and Cyanophyta
d)
Cyanobacteria and Rhodophyta
|
|
Vishal Kumar answered |
Phycobilins are the pigments which are characteristic of red or blue algae. The phycobilins are of two types called as phycoerythrin and phycocyanin. They are composed of open chain of four pyrrole rings. As compared to the structure of chlorophyll pigment, magnesium and phytol chain is absent in phycobilins.
As compared to 1s electron of H-atom in ground state, which of the following properties appear(s) in the radial probability density of 2s electron of H-atom in first excited state?- a)Spherical node appear
- b)Electron charge density is highest in the vicinity of the nucleus
- c)Electron density drops to zero after maximum probability is reache
- d)Electron density rises to second highest valu
Correct answer is option 'A,B,C,D'. Can you explain this answer?
As compared to 1s electron of H-atom in ground state, which of the following properties appear(s) in the radial probability density of 2s electron of H-atom in first excited state?
a)
Spherical node appear
b)
Electron charge density is highest in the vicinity of the nucleus
c)
Electron density drops to zero after maximum probability is reache
d)
Electron density rises to second highest valu
|
Jatin Dasgupta answered |
For2s-electron of H-atom (first excited state)
For 1s-electron of H-atom in ground state
At point Ar = a0 r at point Br > a0
(a) True (b) True (c) True (d) True
For 1s-electron of H-atom in ground state
At point Ar = a0 r at point Br > a0
(a) True (b) True (c) True (d) True
Which of the following statements not true?- a)The velocity vector of a particle at a point is always along the tangent to the path of the particle at that point
- b)The acceleration vector of a particle in uniform circular motion averaged over one cycle is a null vector
- c)The net acceleration of a particle in uniform circular motion is always along the radius of the circle towards the centre
- d)The net acceleration of a particle in circular motion is always along the radius of the circle towards the centre
Correct answer is option 'D'. Can you explain this answer?
Which of the following statements not true?
a)
The velocity vector of a particle at a point is always along the tangent to the path of the particle at that point
b)
The acceleration vector of a particle in uniform circular motion averaged over one cycle is a null vector
c)
The net acceleration of a particle in uniform circular motion is always along the radius of the circle towards the centre
d)
The net acceleration of a particle in circular motion is always along the radius of the circle towards the centre
|
Lead Academy answered |
Option A: True. The velocity vector of a particle at any point on its path is always tangent to the path at that point, as velocity represents the direction of motion.
Option B: True. For a particle in uniform circular motion, the centripetal acceleration points towards the center. Over one complete cycle, the acceleration vectors cancel out, resulting in an average acceleration of zero (null vector).
Option C: True. The net acceleration in uniform circular motion is centripetal acceleration, which always points towards the center of the circle along the radius.
Option D: Not true. This statement is incorrect because it implies that the net acceleration in all types of circular motion is always radial. While in uniform circular motion, the acceleration is purely radial, in non-uniform circular motion, there is an additional tangential component of acceleration due to the change in speed. Thus, the net acceleration in such cases is not always directed towards the center.
Select the correct statement(s).- a)|
| measures the electron probability density at point in an atom - b)
and | | vary as a function of the three coordinates r (radial), θ and (
(angular part) - c)Angular wave function ‘θ’ depends an only l and m, and is independent of n
- d)All of the above are correct statements
Correct answer is option 'D'. Can you explain this answer?
Select the correct statement(s).
a)
| | measures the electron probability density at point in an atom
| measures the electron probability density at point in an atomb)
and | | vary as a function of the three coordinates r (radial), θ and ( (angular part)c)
Angular wave function ‘θ’ depends an only l and m, and is independent of n
’ depends an only l and m, and is independent of nd)
All of the above are correct statements
|
Telecom Tuners answered |
Thus, 
is d e pendent on r true
is d e pendent on r true
(b)
and | | are dependent on r, θ and 
: true(c) Angular wave function is determined by /land m, and not by n: true
Which orbital gives an electron, a greater probability being found close to the nucleus?- a)3p
- b)3d
- c)3s
- d)equal
Correct answer is option 'C'. Can you explain this answer?
Which orbital gives an electron, a greater probability being found close to the nucleus?
a)
3p
b)
3d
c)
3s
d)
equal
|
Atharva Pillai answered |
3s is spherically symmetrical and its electron density is maximum at the nucleus. It decreases with r.
Which of the following is rich in protein?- a)Ulothrix
- b)Spirogyra
- c)Nostoc
- d)Chlorella
Correct answer is option 'D'. Can you explain this answer?
Which of the following is rich in protein?
a)
Ulothrix
b)
Spirogyra
c)
Nostoc
d)
Chlorella
|
Rahul Iyer answered |
Rich in Protein: Chlorella
Chlorella is a type of green algae that is known for its high protein content. It is considered one of the most protein-rich plant-based sources available. Here are the reasons why Chlorella is rich in protein:
1. Protein Content
Chlorella contains a significant amount of protein, with around 50-60% of its dry weight being protein. This high protein content makes it an excellent source for meeting dietary protein requirements.
2. Essential Amino Acids
Proteins are composed of amino acids, and Chlorella provides a good balance of essential amino acids. Essential amino acids are those that the body cannot produce on its own and must be obtained from the diet. Chlorella contains all the essential amino acids, making it a complete protein source.
3. Bioavailability
The protein in Chlorella is highly bioavailable, meaning it can be easily absorbed and utilized by the body. This makes it an efficient source of protein for various bodily functions, including muscle repair and growth.
4. Nutrient Density
Apart from its protein content, Chlorella is also rich in other essential nutrients. It contains vitamins, minerals, antioxidants, and omega-3 fatty acids, which contribute to overall health and well-being. This nutrient density makes Chlorella a valuable addition to a balanced diet.
5. Digestibility
Chlorella has a unique cell wall structure that requires special processing to enhance its digestibility. By breaking down the cell wall, the nutrients, including protein, become more accessible to the digestive system, allowing for better absorption and utilization.
In conclusion, Chlorella is rich in protein due to its high protein content, essential amino acid profile, bioavailability, nutrient density, and digestibility. It can be a beneficial source of protein for individuals following plant-based diets or seeking alternative protein sources.
A projectile is fired a velocity of 150 meters per second at an angle of 30 degrees with the horizontal. What is the magnitude of the vertical component of the velocity at the time the projectile is fired?- a)130 m/s
- b)75 m/s
- c)225 m/s
- d)150 m/s
Correct answer is option 'B'. Can you explain this answer?
A projectile is fired a velocity of 150 meters per second at an angle of 30 degrees with the horizontal. What is the magnitude of the vertical component of the velocity at the time the projectile is fired?
a)
130 m/s
b)
75 m/s
c)
225 m/s
d)
150 m/s
|
Nandini Patel answered |
The vertical component of the velocity is given by 150sin(30 ) =150X0.5 =75 m/s.
What type of reproduction typically occurs in green algae such as Ulothrix and Spirogyra?
- a)Vegetative reproduction
- b)Sexual reproduction
- c)Asexual reproduction by zoospores
- d)Fragmentation
Correct answer is option 'C'. Can you explain this answer?
What type of reproduction typically occurs in green algae such as Ulothrix and Spirogyra?
a)
Vegetative reproduction
b)
Sexual reproduction
c)
Asexual reproduction by zoospores
d)
Fragmentation
|
Nipuns Institute answered |
Green algae, including Ulothrix and Spirogyra, typically undergo asexual reproduction by the production of flagellated zoospores. These zoospores are motile and give rise to new plants upon germination.
A man can swim with a speed of 4.0 km/h in still water. How long does he take to cross a river 1.0 km wide if the river flows steadily at 3.0 km/h and he makes his strokes normal to the river current? How far down the river does he go when he reaches the other bank?- a)13 min, 700 m
- b)16 min, 650 m
- c)19 min, 500 m
- d)15 min, 750 m
Correct answer is option 'D'. Can you explain this answer?
A man can swim with a speed of 4.0 km/h in still water. How long does he take to cross a river 1.0 km wide if the river flows steadily at 3.0 km/h and he makes his strokes normal to the river current? How far down the river does he go when he reaches the other bank?
a)
13 min, 700 m
b)
16 min, 650 m
c)
19 min, 500 m
d)
15 min, 750 m
|
Stuti Kumar answered |
Explanation:
Speed of the man, vm = 4 km/h
Width of the river = 1 km
Width of the river = 1 km
What is the primary function of pyrenoids in some green algae?- a)Storage of oil droplets
- b)Storage of protein and starch
- c)Photosynthesis
- d)Sexual reproduction
Correct answer is option 'B'. Can you explain this answer?
What is the primary function of pyrenoids in some green algae?
a)
Storage of oil droplets
b)
Storage of protein and starch
c)
Photosynthesis
d)
Sexual reproduction
|
Ciel Knowledge answered |
Most of the members of green algae have one or more storage bodies called pyrenoids located in the chloroplasts. Pyrenoids contain protein besides starch. Some algae may store food in the form of oil droplets.
Consider the following statements regarding brown algae:
I. The pigments are chlorophyll a, c, and xanthophylls, including fucoxanthin.
II. Storage food is laminarin and mannitol.
III. The cellulosic cell wall is covered with algin.
IV. They do not have a centrally located vacuole.
V. Their photosynthetic organs are called fronds, which are leaf-like structures.
VI. They have pear-shaped biflagellate zoospores.
VII. They have two unequal laterally attached flagella.
The number of correct statements is:
- a)5
- b)6
- c)4
- d)7
Correct answer is option 'B'. Can you explain this answer?
Consider the following statements regarding brown algae:
I. The pigments are chlorophyll a, c, and xanthophylls, including fucoxanthin.
II. Storage food is laminarin and mannitol.
III. The cellulosic cell wall is covered with algin.
IV. They do not have a centrally located vacuole.
V. Their photosynthetic organs are called fronds, which are leaf-like structures.
VI. They have pear-shaped biflagellate zoospores.
VII. They have two unequal laterally attached flagella.
II. Storage food is laminarin and mannitol.
III. The cellulosic cell wall is covered with algin.
IV. They do not have a centrally located vacuole.
V. Their photosynthetic organs are called fronds, which are leaf-like structures.
VI. They have pear-shaped biflagellate zoospores.
VII. They have two unequal laterally attached flagella.
The number of correct statements is:
a)
5
b)
6
c)
4
d)
7
|
Stepway Academy answered |
Correct answer: B. 6
Explanation:
The correct statements are:
I. True. Brown algae contain chlorophyll a, c, and fucoxanthin, which give them their characteristic color.
II. True. Laminarin and mannitol are the storage products in brown algae.
III. True. The cell wall of brown algae is composed of cellulose and is covered with algin, a gelatinous substance.
IV. False. Brown algae do not typically have a centrally located vacuole; this is more characteristic of plant cells.
V. True. The photosynthetic organs of brown algae are called fronds, which are leaf-like structures.
VI. True. Brown algae produce pear-shaped biflagellate zoospores.
VII. True. The zoospores have two unequal, laterally attached flagella.
II. True. Laminarin and mannitol are the storage products in brown algae.
III. True. The cell wall of brown algae is composed of cellulose and is covered with algin, a gelatinous substance.
IV. False. Brown algae do not typically have a centrally located vacuole; this is more characteristic of plant cells.
V. True. The photosynthetic organs of brown algae are called fronds, which are leaf-like structures.
VI. True. Brown algae produce pear-shaped biflagellate zoospores.
VII. True. The zoospores have two unequal, laterally attached flagella.
So, the number of correct statements is 6.
A man standing on the roof of a house of height h throws one particle vertically downwards and another particle horizontally with the same velocity u. The ratio of their velocities when they reach the earth’s surface will be- a)
- b)1 : 2
- c)1 : 1
- d)
Correct answer is option 'C'. Can you explain this answer?
A man standing on the roof of a house of height h throws one particle vertically downwards and another particle horizontally with the same velocity u. The ratio of their velocities when they reach the earth’s surface will be
a)
b)
1 : 2
c)
1 : 1
d)
|
Ambition Institute answered |
Particle 1 (Thrown Vertically Downward):
Initial velocity (u) is downward.
Final velocity is affected by gravity. Using the equation of motion:
Particle 2 (Thrown Horizontally):
Horizontal velocity remains constant (u).
Vertical velocity due to free fall can be calculated as:
The resultant velocity (v2) at the Earth's surface is given by combining the horizontal and vertical velocities using the Pythagorean theorem:
Velocity Ratio:
The magnitude of both velocities is the same:
Thus, the ratio of their velocities is: 1 : 1
The magnitude of both velocities is the same:
Thus, the ratio of their velocities is: 1 : 1
For 2s-orbital electron, radial probability density R2 as function of r (distance) is given by- a)
- b)
- c)
- d)all of these
Correct answer is option 'B'. Can you explain this answer?
For 2s-orbital electron, radial probability density R2 as function of r (distance) is given by
a)
b)
c)
d)
all of these
|
Top Rankers answered |
Correct Answer : b
Explanation : (a) It represents R2 vs r for 1s
(b) It represents R2 vs r for2s
(c) It represents R2 vs r for 2p
Direction (Q. Nos. 1-12) This section contains 12 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.Q. Radial wave functio ns (R) of different orbitals are plotted. Which is/are correct graphs?- a)
- b)
- c)
- d)All of these
Correct answer is option 'D'. Can you explain this answer?
Direction (Q. Nos. 1-12) This section contains 12 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.
Q. Radial wave functio ns (R) of different orbitals are plotted. Which is/are correct graphs?
a)
b)
c)
d)
All of these
|
Amrutha Chaudhary answered |
For 1s-orbital radial wave function (Ft) is maximum at r - 0, and falls rapidly as r increases thus, (a) correct.
For2s-orbital, radial wave function (R) is maximum at (r = 0), falls to zero and further decreases with r. There appears radial nodes. Thus (b) correct.
For2p-orbital, radial wave function is zero at r = 0, reaches maximum value (at r = a0) and then falls thus (c) is correct.
For2s-orbital, radial wave function (R) is maximum at (r = 0), falls to zero and further decreases with r. There appears radial nodes. Thus (b) correct.
For2p-orbital, radial wave function is zero at r = 0, reaches maximum value (at r = a0) and then falls thus (c) is correct.
A passenger arriving in a new town wishes to go from the station to a hotel located 10 km away on a straight road from the station. A dishonest cabman takes him along a circuitous path 23 km long and reaches the hotel in 28 min. What is (a) the average speed of the taxi, (b) the magnitude of average velocity?- a)47.3 km/hr, 23.4 km/hr
- b)48.3 km/hr, 22.4 km/hr
- c)49.3 km/hr, 21.4 km/hr
- d)46.3 km/hr, 24.4 km/hr
Correct answer is option 'C'. Can you explain this answer?
A passenger arriving in a new town wishes to go from the station to a hotel located 10 km away on a straight road from the station. A dishonest cabman takes him along a circuitous path 23 km long and reaches the hotel in 28 min. What is (a) the average speed of the taxi, (b) the magnitude of average velocity?
a)
47.3 km/hr, 23.4 km/hr
b)
48.3 km/hr, 22.4 km/hr
c)
49.3 km/hr, 21.4 km/hr
d)
46.3 km/hr, 24.4 km/hr
|
|
Rahul Bansal answered |
Given,
Magnitude of displacement = 10 km
Total path length = 23 km
Time taken = 28 min = 7/15 hr.
Therefore,
Therefore, we can see that the average speed and magnitude of average velocity are not equal.
We can define the difference of two vectors A and B as the- a)sum of two vectors A and B' such that B' is equal to B multiplied by 0
- b)sum of two vectors A and B' such that B' is equal to B multiplied by -1
- c)sum of two vectors A and B' such that B' is equal to B multiplied by -2
- d)sum of two vectors A and B' such that B' is equal to B multiplied by 1
Correct answer is option 'B'. Can you explain this answer?
We can define the difference of two vectors A and B as the
a)
sum of two vectors A and B' such that B' is equal to B multiplied by 0
b)
sum of two vectors A and B' such that B' is equal to B multiplied by -1
c)
sum of two vectors A and B' such that B' is equal to B multiplied by -2
d)
sum of two vectors A and B' such that B' is equal to B multiplied by 1
|
Surbhi Mishra answered |
Explanation:
Vector subtraction is defined in the following way.
- The difference of two vectors, A - B , is a vector C that is, C = A - B
- The addition of two vector such that C = A + (-B). B has been taken in opposite direction.
Thus vector subtraction can be represented as a vector addition.
In a harbor, wind is blowing at the speed of 72 km/h and the flag on the mast of a boat anchored in the harbor flutters along the N-E direction. If the boat starts moving at a speed of 51 km/h to the north, what is the direction of the flag on the mast of the boat?- a)approximately north
- b)approximately north-east
- c)approximately east
- d)approximately south
Correct answer is option 'C'. Can you explain this answer?
In a harbor, wind is blowing at the speed of 72 km/h and the flag on the mast of a boat anchored in the harbor flutters along the N-E direction. If the boat starts moving at a speed of 51 km/h to the north, what is the direction of the flag on the mast of the boat?
a)
approximately north
b)
approximately north-east
c)
approximately east
d)
approximately south
|
Ankita Patel answered |
Explanation:The flag is fluttering in the north-east direction. It shows that the wind is blowing toward the north-east direction. When the ship begins sailing toward the north, the flag will move along the direction of the relative velocity (vwb) of the wind with respect to the boat.
Hence, the flag will flutter approximately due east.
For an electron in 2p-orbital, radial probability function 4πr2R2 as a function of r is given by- a)
- b)
- c)
- d)
Correct answer is option 'D'. Can you explain this answer?
For an electron in 2p-orbital, radial probability function 4πr2R2 as a function of r is given by
a)
b)
c)
d)
|
Nikhil Sen answered |
(a) Describes radial wave function as a function of r for 1s
(b) Describes radial probability function as a function of r for 2s
(c) Describes radial wave function as a function r for 2s
(d) Describes radial probability function as a function of r for 2p
(b) Describes radial probability function as a function of r for 2s
(c) Describes radial wave function as a function r for 2s
(d) Describes radial probability function as a function of r for 2p
Which class of algae is known for producing hydrocolloids such as algin and carrageen, which are used commercially?- a)Chlorophyceae
- b)Rhodophyceae
- c)Phaeophyceae
- d)Both B and C.
Correct answer is option 'D'. Can you explain this answer?
Which class of algae is known for producing hydrocolloids such as algin and carrageen, which are used commercially?
a)
Chlorophyceae
b)
Rhodophyceae
c)
Phaeophyceae
d)
Both B and C.
|
|
Ambition Institute answered |
- Phaeophyceae or brown algae are mostly marine algae.
- They possess xanthophyll pigment, fucoxanthin due to which their color varies from olive green to various shades of brown.
- Chlorophyceae or green algae are usually green in color usually due to the dominance of pigments chlorophyll a and b.
- The members of Rhodophyceae are commonly called red algae because of the predominance of the red pigment, phycoerythrin.
- Algae are useful to man in a variety of ways.
- Certain marine brown and red algae produce large amounts of hydrocolloids (water holding substances), e.g., algin (brown algae) and carrageen (red algae) which are used commercially.
Rain is falling vertically with a speed of 30 m s−1. A woman rides a bicycle with a speed of 10 m s−1 in the north to south direction. What is the direction in which she should hold her umbrella?- a)about 18∘ with the vertical, towards the south
- b)about 28∘ with the vertical, towards the south
- c)about 28∘ with the vertical, towards the north
- d)about 18∘ with the vertical, towards the north
Correct answer is option 'A'. Can you explain this answer?
Rain is falling vertically with a speed of 30 m s−1. A woman rides a bicycle with a speed of 10 m s−1 in the north to south direction. What is the direction in which she should hold her umbrella?
a)
about 18∘ with the vertical, towards the south
b)
about 28∘ with the vertical, towards the south
c)
about 28∘ with the vertical, towards the north
d)
about 18∘ with the vertical, towards the north
|
Jyoti Kapoor answered |
In order to protect herself from the rain, the woman must hold her umbrella in the direction of the relative velocity (v) of the rain with respect to the woman.
v = vr + (-vc)
= 30 + (-10) = 20 m/s
tan θ = vc / vr = 10 / 30
θ = tan^-1 (1 / 3)
= tan^-1 (0.333) ≈ 18 degree
Hence, the woman must hold the umbrella toward the south, at an angle of nearly 18 degree with the vertical.
A body is projected with velocity 20√3 m/s with an angle of projection 60° with horizontal. Calculate velocity on that point where body makes an angle 30° with the horizontal.- a)20 m/s
- b)20 /√3 m/s
- c)10 /√3 m/s
- d)10 m/s
Correct answer is option 'A'. Can you explain this answer?
A body is projected with velocity 20√3 m/s with an angle of projection 60° with horizontal. Calculate velocity on that point where body makes an angle 30° with the horizontal.
a)
20 m/s
b)
20 /√3 m/s
c)
10 /√3 m/s
d)
10 m/s
|
Mohit Rajpoot answered |
The velocity of the body at any point during its motion is composed of:
- Horizontal Component (vx): This remains constant throughout the motion because there’s no horizontal acceleration.
Using cos 60∘ = 1/2
- Vertical Component (vy): This changes with time due to the acceleration due to gravity (g = 9.8 m/s2). At the point where the angle with the horizontal is 30∘, the relation between the components of velocity is:
Using tan 
Solve for vy :
- Magnitude of the Velocity (v): The total velocity is the vector sum of vx and vy :
Substitute
Final Answer:
The speed of the body at the point where it makes an angle of 30∘ with the horizontal is: 20 m/s
The speed of the body at the point where it makes an angle of 30∘ with the horizontal is: 20 m/s
If you are asked to classify the various algae into distinct groups, which of the following characters should you choose?- a)Types of pigments present in the cell
- b)Nature of stored food materials in the cell
- c)Structural organization of thallus
- d)Chemical composition of the cell wall
Correct answer is option 'A'. Can you explain this answer?
a)
Types of pigments present in the cell
b)
Nature of stored food materials in the cell
c)
Structural organization of thallus
d)
Chemical composition of the cell wall
|
|
Nipuns Institute answered |
The classification of algae into major groups (such as Chlorophyceae, Phaeophyceae, and Rhodophyceae) is primarily based on the types of pigments they contain. These pigments not only give the algae their characteristic colors but also reflect their evolutionary relationships and ecological adaptations.
is the sum of two energy operators. These are
Fusion between one large, nonmotile (static) female gamete and a smaller, motile male gamete is termed as - a)Oogamous
- b)Anisogamy
- c)Isogamy
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
Fusion between one large, nonmotile (static) female gamete and a smaller, motile male gamete is termed as
a)
Oogamous
b)
Anisogamy
c)
Isogamy
d)
None of these
|
|
Varun Chakraborty answered |
Understanding Gamete Fusion
In the context of sexual reproduction, the fusion of gametes is a crucial process.
Types of Gametes
- Female Gamete: The female gamete, known as the ovum, is typically larger and nonmotile (static).
- Male Gamete: The male gamete, called the sperm, is smaller and motile, allowing it to swim towards the female gamete.
Oogamous Reproduction
- Definition: Oogamy is a form of sexual reproduction characterized by the fusion of a large, nonmotile female gamete (ovum) with a smaller, motile male gamete (sperm).
- Significance: This strategy promotes genetic diversity, as the combination of different genetic materials can lead to varied offspring.
Comparison with Other Types
- Anisogamy: While oogamy is a type of anisogamy, anisogamy refers to the production of two distinct types of gametes (large and small) rather than the specific fusion of a large female and a small male gamete.
- Isogamy: This involves the fusion of gametes that are similar in size and motility, meaning both gametes are equal and can move. This is not applicable in the case of oogamy.
- None of These: The term "none of these" is incorrect as oogamy accurately describes the fusion process in question.
Conclusion
Thus, the correct answer is option A: Oogamous, highlighting the combination of a large, static female gamete and a small, motile male gamete, which is a fundamental characteristic of many organisms, particularly in the animal kingdom. Understanding these classifications helps in grasping the diversity of reproductive strategies in nature.
In the context of sexual reproduction, the fusion of gametes is a crucial process.
Types of Gametes
- Female Gamete: The female gamete, known as the ovum, is typically larger and nonmotile (static).
- Male Gamete: The male gamete, called the sperm, is smaller and motile, allowing it to swim towards the female gamete.
Oogamous Reproduction
- Definition: Oogamy is a form of sexual reproduction characterized by the fusion of a large, nonmotile female gamete (ovum) with a smaller, motile male gamete (sperm).
- Significance: This strategy promotes genetic diversity, as the combination of different genetic materials can lead to varied offspring.
Comparison with Other Types
- Anisogamy: While oogamy is a type of anisogamy, anisogamy refers to the production of two distinct types of gametes (large and small) rather than the specific fusion of a large female and a small male gamete.
- Isogamy: This involves the fusion of gametes that are similar in size and motility, meaning both gametes are equal and can move. This is not applicable in the case of oogamy.
- None of These: The term "none of these" is incorrect as oogamy accurately describes the fusion process in question.
Conclusion
Thus, the correct answer is option A: Oogamous, highlighting the combination of a large, static female gamete and a small, motile male gamete, which is a fundamental characteristic of many organisms, particularly in the animal kingdom. Understanding these classifications helps in grasping the diversity of reproductive strategies in nature.
at any point is proportional to- a)the probability of finding the particle at that point
- b)energy of the electron
- c)radius of the orbital
- d)(radius)-1 of the orbital
Correct answer is option 'A'. Can you explain this answer?
at any point is proportional toa)
the probability of finding the particle at that point
b)
energy of the electron
c)
radius of the orbital
d)
(radius)-1 of the orbital
|
Tejas Chawla answered |
Radial probability density = 4πr2
of find in g the electron within the volume of a very thin spherical shell at a distance r from nucleus.
of find in g the electron within the volume of a very thin spherical shell at a distance r from nucleus.Can you explain the answer of this question below:C onsider the following figures A and B indicating distribution of charge density (electron probability 
) with distance r
Select the correct statement(s).
- A:
Both A and B are for 1s
- B:
Both A and B are for 2s
- C:
A is for 2s and B is for 1s
- D:
A is for 1s and B is for 2s
The answer is d.
C onsider the following figures A and B indicating distribution of charge density (electron probability ) with distance r
Select the correct statement(s).
Both A and B are for 1s
Both A and B are for 2s
A is for 2s and B is for 1s
A is for 1s and B is for 2s
|
Nandini Nair answered |
in case of 1s, falls as r increases thus, (A) is for 1s.
In case of 2s, is maximum in the vicinity o f the nucleus, falls to zero giving spherical nodes and then rises to second highest value. Thus, (6) is for2s
falls as r increases thus, (A) is for 1s.In case of 2s,
is maximum in the vicinity o f the nucleus, falls to zero giving spherical nodes and then rises to second highest value. Thus, (6) is for2sThe reason why cyclists bank when taking a sharp turn is- a)cyclists enjoy turning to one side and so bank
- b)to decelerate at the turns as turns are dangerous
- c)to supply the acceleration required to move fast
- d)to supply the sidewise (centripetal) acceleration required to make the direction change
Correct answer is option 'D'. Can you explain this answer?
The reason why cyclists bank when taking a sharp turn is
a)
cyclists enjoy turning to one side and so bank
b)
to decelerate at the turns as turns are dangerous
c)
to supply the acceleration required to move fast
d)
to supply the sidewise (centripetal) acceleration required to make the direction change
|
Tanvi Roy answered |
Explanation:In order to take a safe turn, the cyclist has to bend a little from his vertical position. In this case, a component of the reaction provides the required centripetal force.If q is angle made by the cyclist with the vertical then
In actual practice, the value of q is slightly less because the force of friction also contributes towards the centripetal force.
A sports car has a “lateral acceleration” of 0.96g = 9.4 m s−2. This is the maximum centripetal acceleration the car can sustain without skidding out of a curved path. If the car is traveling at a constant 40 m/s on level ground, what is the radius R of the tightest unbanked curve it can negotiate?- a)minimum radius = 160 m
- b)minimum radius = 170 m
- c)minimum radius = 180 m
- d)minimum radius = 175 m
Correct answer is option 'B'. Can you explain this answer?
A sports car has a “lateral acceleration” of 0.96g = 9.4 m s−2. This is the maximum centripetal acceleration the car can sustain without skidding out of a curved path. If the car is traveling at a constant 40 m/s on level ground, what is the radius R of the tightest unbanked curve it can negotiate?
a)
minimum radius = 160 m
b)
minimum radius = 170 m
c)
minimum radius = 180 m
d)
minimum radius = 175 m
|
|
Priya Deshpande answered |
Explanation:
The car is in uniform circular motion because it’s moving at a constant speed along a curve that is a segment of a circle. Hence we know
This is the minimum turning radius because arad is the maximum centripetal acceleration.
Leaf like photosynthetic organ is associated with algal group- a)Showing only oogamous reproduction
- b)Having predominance of r-phycoerythrin
- c)Where members may reach a height of 100 metres
- d)Usually having grass-green colour
Correct answer is option 'C'. Can you explain this answer?
Leaf like photosynthetic organ is associated with algal group
a)
Showing only oogamous reproduction
b)
Having predominance of r-phycoerythrin
c)
Where members may reach a height of 100 metres
d)
Usually having grass-green colour
|
EduRev NEET answered |
The members of phaeophyceae or brown algae are found primarily in marine habitats. They show great variation in size and form. They range from simple branched, filamentous forms (Ectocarpus) to profusely branched forms as represented by kelps, which may reach a height of 100 metres.They possess chlorophyll a, c, carotenoids and xanthophylls. They vary in colour from olive green to various shades of brown depending upon the amount of the xanthophyll pigment, fucoxanthin present in them. Food is stored as complex carbohydrates, which may be in the form of laminarin or mannitol. The vegetative cells have a cellulosic wall usually covered on the outside by a gelatinous coating of algin. The protoplast contains, in addition to plastids, a centrally located vacuole and nucleus. The plant body is usually attached to the substratum by a holdfast, and has a stalk, the stipe and leaf like photosynthetic organ – the frond.
What is the primary pigment responsible for the red color in most red algae?- a)Chlorophyll a
- b)Chlorophyll b
- c)R-phycoerythrin
- d)Fucoxanthin
Correct answer is option 'C'. Can you explain this answer?
What is the primary pigment responsible for the red color in most red algae?
a)
Chlorophyll a
b)
Chlorophyll b
c)
R-phycoerythrin
d)
Fucoxanthin
|
Jyoti Shah answered |
Primary Pigment in Red Algae
Red algae, scientifically known as Rhodophyta, are primarily characterized by their vibrant red pigmentation. The key pigment responsible for this distinct color is R-phycoerythrin.
Understanding R-phycoerythrin
- R-phycoerythrin is a type of phycoerythrin, which is a protein pigment.
- It absorbs light in the blue and green wavelengths, allowing red algae to thrive in deeper water where light penetration is limited.
- The red color of R-phycoerythrin serves not only for photosynthesis but also provides protection against intense light.
Photosynthesis in Red Algae
- Red algae utilize R-phycoerythrin to capture light energy, which is then used in the photosynthesis process.
- This pigment works in conjunction with chlorophyll a, enabling red algae to convert sunlight into energy efficiently.
Ecological Significance
- The unique pigment composition allows red algae to inhabit various marine environments, including coral reefs and deep oceanic regions.
- The ability to absorb different wavelengths enhances their adaptability and ecological role in aquatic ecosystems.
In summary, R-phycoerythrin is the primary pigment responsible for the red color in most red algae, playing a crucial role in their photosynthetic process and ecological adaptation.
Red algae, scientifically known as Rhodophyta, are primarily characterized by their vibrant red pigmentation. The key pigment responsible for this distinct color is R-phycoerythrin.
Understanding R-phycoerythrin
- R-phycoerythrin is a type of phycoerythrin, which is a protein pigment.
- It absorbs light in the blue and green wavelengths, allowing red algae to thrive in deeper water where light penetration is limited.
- The red color of R-phycoerythrin serves not only for photosynthesis but also provides protection against intense light.
Photosynthesis in Red Algae
- Red algae utilize R-phycoerythrin to capture light energy, which is then used in the photosynthesis process.
- This pigment works in conjunction with chlorophyll a, enabling red algae to convert sunlight into energy efficiently.
Ecological Significance
- The unique pigment composition allows red algae to inhabit various marine environments, including coral reefs and deep oceanic regions.
- The ability to absorb different wavelengths enhances their adaptability and ecological role in aquatic ecosystems.
In summary, R-phycoerythrin is the primary pigment responsible for the red color in most red algae, playing a crucial role in their photosynthetic process and ecological adaptation.
A motorcycle stunt rider rides off the edge of a cliff. Just at the edge his velocity is horizontal, with magnitude 9.0 m/s. Find the magnitude of the motorcycle’s position vector after 0.50s it leaves the edge of the cliff.
- a)4.7 m
- b)5.2 m
- c)6.8 m
- d)7.2 m
Correct answer is option 'A'. Can you explain this answer?
A motorcycle stunt rider rides off the edge of a cliff. Just at the edge his velocity is horizontal, with magnitude 9.0 m/s. Find the magnitude of the motorcycle’s position vector after 0.50s it leaves the edge of the cliff.
a)
4.7 m
b)
5.2 m
c)
6.8 m
d)
7.2 m
|
Advait Ghoshal answered |
Explanation:The motorcycle’s x- and y-coordinates at t=0.50 s are
The negative value of y shows that the motorcycle is below its starting point.
The motorcycle’s distance from the origin at t=0.50 s is
Sexual reproduction by non-flagellated but similar-sized gametes is seen in:- a)Chlamydomonas
- b)Volvox
- c)Spirogyra
- d)Fucus
Correct answer is option 'C'. Can you explain this answer?
Sexual reproduction by non-flagellated but similar-sized gametes is seen in:
a)
Chlamydomonas
b)
Volvox
c)
Spirogyra
d)
Fucus
|
|
Nipuns Institute answered |
Sexual reproduction takes place through fusion of two gametes. These gametes can be flagellated and similar in size (as in Ulothrix) or non-flagellated (non-motile) but similar in size (as in Spirogyra). Such reproduction is called isogamous
An example of colonial alga is- a)Chlorella
- b)Volvox
- c)Ulothrix
- d)Spirogyra
Correct answer is option 'B'. Can you explain this answer?
An example of colonial alga is
a)
Chlorella
b)
Volvox
c)
Ulothrix
d)
Spirogyra
|
|
Ambition Institute answered |
The form and size of algae is highly variable, ranging from colonial forms like Volvox.
) can be written as
Study the figure and find out incorrect statement. 
- a)Contains laminarin or mannitol as reserve food.
- b) They possess chlorophyll a, c, carotenoids and xanthophylls
- c)Union of gamete may take place in water or within the oogonium.
- d)Gametes with two apically inserted flagella.
Correct answer is option 'D'. Can you explain this answer?
Study the figure and find out incorrect statement.
a)
Contains laminarin or mannitol as reserve food.
b)
They possess chlorophyll a, c, carotenoids and xanthophylls
c)
Union of gamete may take place in water or within the oogonium.
d)
Gametes with two apically inserted flagella.
|
Infinity Academy answered |
The given diagram if of Brown Algae ( Fucus)
et’s examine each statement about brown algae Fucus to determine which one is incorrect:
- Contains laminarin or mannitol as reserve food.
- This is correct. Brown algae like Fucus store reserve food in the form of laminarin and mannitol.
- They possess chlorophyll a, c, carotenoids and xanthophylls.
This is correct phaeophyceace possess all these pigments. - Union of gametes may take place in water or within the oogonium.
- This is correct. In Fucus, fertilization can occur either in the water or within the oogonium (the female reproductive structure).
- Gametes with two apically inserted flagella.
- This is incorrect. In Fucus, the gametes (sperm) have two laterally inserted flagella, not apically inserted.
So, the incorrect statement about Fucus is:
4. Gametes with two apically inserted flagella.
Radial probability density in the occupied orbital of a hydrogen atom in the ground state (1s) is given below
- a)Radial probability is maximum when (r = a0)
- b)Radial probabilit is maximum when
- c)Radial probability almost falls to zero when
- d)Radial probability is independent of r
Correct answer is option 'A,C'. Can you explain this answer?
Radial probability density in the occupied orbital of a hydrogen atom in the ground state (1s) is given below
a)
Radial probability is maximum when (r = a0)
b)
Radial probabilit is maximum when
c)
Radial probability almost falls to zero when
d)
Radial probability is independent of r
|
Aryan Sen answered |
Radial probability increases as r increase reaches a maximum value when r = a0 (Bohr’s radius) and then falls. When 
radial probability is very small.
Thus, (a) and (c) are true.
radial probability is very small.Thus, (a) and (c) are true.
Direction (Q. Nos. 13-15) This section contains 3 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or MORE THANT ONE is correct.Q. Which of the following properties can be described by wave function 
?- a)Type of orbital occupied by electro
- b)Energy of the electron in the orbita
- c)Shape of the orbita
- d)Probability of finding the electron in any particular region within the orbit
Correct answer is option 'A,B,C,D'. Can you explain this answer?
Direction (Q. Nos. 13-15) This section contains 3 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or MORE THANT ONE is correct.
Q. Which of the following properties can be described by wave function ?
?a)
Type of orbital occupied by electro
b)
Energy of the electron in the orbita
c)
Shape of the orbita
d)
Probability of finding the electron in any particular region within the orbit
|
Rounak Desai answered |
The wave function describ es properties of the orbital and the electron that occupies the orbital
(a) Type of orbital is described : true
(b) Energy of electron : true
(c) Shape of the orbital: true
(d) Probability: true
(a) Type of orbital is described : true
(b) Energy of electron : true
(c) Shape of the orbital: true
(d) Probability: true
Two vectors are equal if- a)the direction is the same for both
- b)the magnitude is the same for both
- c)the magnitude and direction are the same for both
- d)the two vectors have opposite directions
Correct answer is option 'C'. Can you explain this answer?
Two vectors are equal if
a)
the direction is the same for both
b)
the magnitude is the same for both
c)
the magnitude and direction are the same for both
d)
the two vectors have opposite directions
|
|
Stuti Kumar answered |
Explanation:Equal vectors are vectors that have the same magnitude and the same direction. Equal vectors may start at different positions.
Three girls skating on a circular ice ground of radius 200 m start from a point P on the edge of the ground and reach a point Q diametrically opposite to P following different paths as shown in Figure. What is the magnitude of the displacement vector for each ? For which girl is this equal to the actual length of path skate ?
- a)200 m for each; B
- b)200 m for each; A
- c)400 m for each; B
- d)300 m for each; C
Correct answer is option 'C'. Can you explain this answer?
Three girls skating on a circular ice ground of radius 200 m start from a point P on the edge of the ground and reach a point Q diametrically opposite to P following different paths as shown in Figure. What is the magnitude of the displacement vector for each ? For which girl is this equal to the actual length of path skate ?
a)
200 m for each; B
b)
200 m for each; A
c)
400 m for each; B
d)
300 m for each; C
|
Bhavana Chavan answered |
Explanation:
(i) PQ = diameter = displacement for each girl = 2r = 2 x 200 = 400 m
Since, displacement vector does not depend upon the actual path length and it is the shortest distance between initial and final position, so in the case of each girl the displacement is 400 m.
(ii)This is equal to the actual length of the path skated by girl B.
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