NEET
what is lifespan of sperm Related: Male Reproductive Gland?
Related: Male Reproductive Gland
Aryan answered • just now72 hr is maximum time limit . after that it will get degrade .
Sperm are acidic or basic in nature Related: Male Reproductive Gland?
Related: Male Reproductive Gland
Aryan answered • 4 minutes agoSperm is acidic in nature otherwise sperm could not be able to survive because when sperm is released before that cowper's gland and prostate gland secrete alkaline fluid which is very much essential for lubrication of of urinary tract so that the acidity effect of urine can be neutralize and sperm could be able to come out without degradation because sperm can't survive in the acidic medium
Which of the following is not a purpose of transpiration?- a)Helps in absorption and transport in plants
- b)Prevents loss of water
- c)Supplies water for photosynthesis
- d)Maintains shape and structure of plants by keeping the cell turgid
- e)Cools leaf surfaces
Correct answer is option 'B'. Can you explain this answer?
Which of the following is not a purpose of transpiration?
a)
Helps in absorption and transport in plants
b)
Prevents loss of water
c)
Supplies water for photosynthesis
d)
Maintains shape and structure of plants by keeping the cell turgid
e)
Cools leaf surfaces
Manvi Bansal answered • 6 minutes agoLoss of water occurs due to transpiration from leaves and it gives a cooling effect hence 2 is wrong
What is sodalime decarboxylation reaction?
Aa Aa answered • 10 minutes agoCarboxylic acids having alpha hydrogen releases CO2 on heating with sodalime( naoh and cao) .decarboxylation reeaction reduces the no.of carbon from parent chain.
When we say aldol condensation or claisen condensation .what the word condensation signify?
Aa Aa answered • 14 minutes agoWhen 2 molecules unite without any elimination of smaller particle is called condensation.n hence the reaction got name e.g in aldol condensation there is formation of aldol which is alpha hydroxy aldehyde /ketone without any elimination and OH- which used initially given out in last.
What is basic difference between aldol condensation and claisen condensation reaction?
Aa Aa answered • 18 minutes agoAldehyde/ketones having alpha hydrogen in presence of dilute base give aldol condensation reaction.Whereas ESTER having alpha hydrogen in presence of dilute base undergoes claisen condensation reaction.
What happens to aldol condensation reaction products at high temperature?
Aa Aa answered • 23 minutes agoAt very low temperature 5 to 10•C aldols are stable .But at high temperature these aldol undergo ELIMINATION REACTION(removal of water)nd this elimination is E-1CB reaction.
How many bone of a new born baby?
Deepali Patange answered • 26 minutes ago300 bones , and in later development it becomes 206 bones in adults
Which order reaction is aldol condensation reaction?
Aa Aa answered • 28 minutes agoYet aldol condensation reaction has 2 steps.but aldol condensation reaction are usually THIRD ORDER REACTION!! but in very dilute base, order of aldol condensation becomes SECOND ORDER.
How many steps are there is aldol condensation reaction? And which is rate determining step.?
Aa Aa answered • 30 minutes agoThere are 2 steps in aldol condensation reaction.
(1) Acid base reaction
(2) Carbanion attack
in 2nd step carbanion form and is slowest step. and hence this step determine rate of reaction.
(1) Acid base reaction
(2) Carbanion attack
in 2nd step carbanion form and is slowest step. and hence this step determine rate of reaction.
Which is catalyst in aldol condensation reaction?
Aa Aa answered • 34 minutes agoOH- is used as catalyst in aldol condensation reaction.this reaction is given by aldehyde/ ketone having alpha hydrogen in presence of dilute base gives alpa hydroxy aldehyde/ketone.oh- act as base used first n in last step it exists .hence act as catalyst.
Ramesh B.s Ramesh B.s asked • 13 minutes agoA={x:x€R,modulusof x<1},b={x:x€r,|x-1|>=1 then A union B=R-D?
In blue-green algae photosynthesis takes place in –- a)Chloroplasts
- b)Lamellisome
- c)Heterocysts
- d)Caroten
Correct answer is option 'B'. Can you explain this answer?
In blue-green algae photosynthesis takes place in –
a)
Chloroplasts
b)
Lamellisome
c)
Heterocysts
d)
Caroten
Aniruddha Tayade answered • 1 hour agoSince Blue green algae is prokaryotic organism ,it lacks true nucleas and membrane bound cell organelle .The peripheral region of BGA protoplast contains thylakoid.Thylakoids (Lamillisomes) contain photosynthetic pigments (chrolophyll a, xanthophylls, phycobilin) in their membranes and serve as site for photosynthesis. Hence opt B is correct
Shruti Yadav asked • 14 minutes agoReaction of Vinyl acetylene with 1. 1eq HCl 2. Mg ether 3. CO2,H2O,H?
Madhukar Mahajan asked • 15 minutes agoTime period of a simple pendulum of length l is T1 and time period of a uniform rod of the same length l pivoted about one end and oscillating in a vertical plane is T2. Amplitude of oscillations in both the cases is small. Then T1/T2 is- a)
- b)1
- c)
- d)3√T / 2
Correct answer is option 'D'. Can you explain this answer?
Time period of a simple pendulum of length l is T1 and time period of a uniform rod of the same length l pivoted about one end and oscillating in a vertical plane is T2. Amplitude of oscillations in both the cases is small. Then T1/T2 is
a)
b)
1
c)
d)
3√T / 2
Which of the following is the best source of thallium?- a)mica
- b)canallite
- c)alluminite
- d)flue dust
Correct answer is option 'D'. Can you explain this answer?
a)
mica
b)
canallite
c)
alluminite
d)
flue dust
꧁༒gundagi༒꧂ ꧁༒विरेश༒꧂ answered • 1 hour agoSources of thallium
Thallium is found as a mineral in the elements crooksite, lorandite and hutchinsonite. It's also found as a trace element in iron pyrite and obtained from this ore by roasting the mineral. Small amounts of thallium are found in manganese nodules on the ocean floor.
Thallium is found as a mineral in the elements crooksite, lorandite and hutchinsonite. It's also found as a trace element in iron pyrite and obtained from this ore by roasting the mineral. Small amounts of thallium are found in manganese nodules on the ocean floor.
Life span of some organisms?
꧁༒gundagi༒꧂ ꧁༒विरेश༒꧂ answered • 1 hour agoOrganism Average life span Monkey 26 years,Dog 20-30 years,Cat 35-40 years,Horse 60 years.
Sir sure September m h paper?
Tayibatun Nisa answered • 1 hour agoI guess exam will be held on time ,bz the news has circulated the media that admit cards for Jee exams will be released very soon ,may be tomorrow, so we neet aspirants can also assume that our admit cards will also be released and exams may be held on time,anyways we shouldn't pay heed to any false rumours and we should keep our preparation going on .
what is metabolism?
Afifa Aaliya answered • 1 hour agoMetabolism is a chemical reaction in the body cells that change food into energy. Specific proteins in the body control the chemical reactions of metabolism.
Percentage of chlorophyll in a normal chloroplast- a)5 - 10%
- b)40-50%
- c)65 - 75%
- d)90 - 95%
Correct answer is option 'A'. Can you explain this answer?
Percentage of chlorophyll in a normal chloroplast
a)
5 - 10%
b)
40-50%
c)
65 - 75%
d)
90 - 95%
Afifa Aaliya answered • 1 hour agoPercentage of a chlorophyll in normal chloroplast is 5 to 10.The concentration of a chlorophyll in a chloroplast is approx 30mM.
So option " A " is correct answer.
So option " A " is correct answer.
Hey how you feel if on frndship day only ur bestii has been break ur frndship?
Swetha L answered • 2 hours agoIt's like a broken heart , lonely feel
but u want to understand that every time is not benefit and happiness to you.
and someday your true friend will come back in ur life or maybe not
but remember one thing :make ur smile and cry as your bestie that's always gives a warm healing feels
if your friend are really understood you
bu... more
but u want to understand that every time is not benefit and happiness to you.
and someday your true friend will come back in ur life or maybe not
but remember one thing :make ur smile and cry as your bestie that's always gives a warm healing feels
if your friend are really understood you
bu... more
Ahir Yadav asked • 34 minutes agoThe image of the sun is formed on the photosensitive metal with a convex lens and the photoelectric current is I . If the lens is replaced by another similar lens of half the diameter and double the focal length, then photoelectric current will be- a)I
- b)I/4
- c)I/8
- d)I/16
Correct answer is option 'D'. Can you explain this answer?
The image of the sun is formed on the photosensitive metal with a convex lens and the photoelectric current is I . If the lens is replaced by another similar lens of half the diameter and double the focal length, then photoelectric current will be
a)
I
b)
I/4
c)
I/8
d)
I/16
Rashmi Rathi asked • 38 minutes agoA gas at 27°C temperature and 30 atmospheric pressure is allowed to expand to the atmospheric pressure. If the volume becomes 10 times its initial volume, then the final temperature becomes- a)100°C
- b)173°C
- c)273°C
- d)-173°C
Correct answer is option 'D'. Can you explain this answer?
A gas at 27°C temperature and 30 atmospheric pressure is allowed to expand to the atmospheric pressure. If the volume becomes 10 times its initial volume, then the final temperature becomes
a)
100°C
b)
173°C
c)
273°C
d)
-173°C
Muskaan Rajhansh asked • 40 minutes agoOn a cold morning, a metal surface will feel colder to touch than a wooden surface because- a)Metal has high specific heat
- b)Metal has high thermal conductivity
- c)Metal has low specific heat
- d)Metal has low thermal conductivity
Correct answer is option 'B'. Can you explain this answer?
On a cold morning, a metal surface will feel colder to touch than a wooden surface because
a)
Metal has high specific heat
b)
Metal has high thermal conductivity
c)
Metal has low specific heat
d)
Metal has low thermal conductivity
Bkj Group asked • 45 minutes agoGive all fingertips questions on sexual reproduction in flowering plants?
Mukesh Kumar asked • 47 minutes agoAn electron of mass m when accelerated through a potential difference V has de Broglie wavelength λ. The de Broglie wavelength associated with a proton of mass M accelerated through the same potential difference will be- a)λ m/M
- b)λ √m/M
- c)λ M/m
- d)λ √M/m
Correct answer is option 'B'. Can you explain this answer?
An electron of mass m when accelerated through a potential difference V has de Broglie wavelength λ. The de Broglie wavelength associated with a proton of mass M accelerated through the same potential difference will be
a)
λ m/M
b)
λ √m/M
c)
λ M/m
d)
λ √M/m
Omansh Sharma asked • 55 minutes agoA horizontal force, just sufficient to move a body of mass 4kg lying on a rough horizontal surface is applied on it. The coefficients of static and kinetic friction between the body and the surface are 0.8 and 0.6 respectively. If the force continues to act even after the block has started moving, the acceleration of the block in m s−2 is [g = 10 m s − 2 ]- a)1/4
- b)1/2
- c)2
- d)4
Correct answer is option 'C'. Can you explain this answer?
A horizontal force, just sufficient to move a body of mass 4kg lying on a rough horizontal surface is applied on it. The coefficients of static and kinetic friction between the body and the surface are 0.8 and 0.6 respectively. If the force continues to act even after the block has started moving, the acceleration of the block in m s−2 is [g = 10 m s − 2 ]
a)
1/4
b)
1/2
c)
2
d)
4
Aisha Mahboob asked • 55 minutes agoThree identical cells each of e.m.f. 2 V and unknown internal resistances are connected in parallel. This combination is connected to a 5 Ω resistor. If the terminal voltage across the cell is 1.5 V, then internal resistance of each cell is- a)3 Ω
- b)4 Ω
- c)5 Ω
- d)6 Ω
Correct answer is option 'C'. Can you explain this answer?
Three identical cells each of e.m.f. 2 V and unknown internal resistances are connected in parallel. This combination is connected to a 5 Ω resistor. If the terminal voltage across the cell is 1.5 V, then internal resistance of each cell is
a)
3 Ω
b)
4 Ω
c)
5 Ω
d)
6 Ω
Monika Kumar asked • 1 hour agoThe primary and secondary coils of a transformer have 50 and 1500 turns respectively. If the magnetic flux φ linked with the primary coil is given by φ = φ 0 + 4t, where φ is in weber, t is time in second and φ 0 is a constant, the output voltage across the secondary coil is- a)90 V
- b)120 V
- c)220 V
- d)30 V
Correct answer is option 'B'. Can you explain this answer?
The primary and secondary coils of a transformer have 50 and 1500 turns respectively. If the magnetic flux φ linked with the primary coil is given by φ = φ 0 + 4t, where φ is in weber, t is time in second and φ 0 is a constant, the output voltage across the secondary coil is
a)
90 V
b)
120 V
c)
220 V
d)
30 V
Sainath Reddy asked • 1 hour agoRain drops fall from a height under gravity; we observe that :- a)Their velocities go on increasing until they hit the ground but the velocity with which the
drops hit the ground differs with the radius of the rain drop - b)Their velocities go on increasing until they hit the ground, velocity being independent of the radius of the drop
- c)They fall with a terminal velocity which is independent of the radius of the rain drop
- d)They fall with a terminal velocity which depends upon the radius of the rain drop
Correct answer is option 'D'. Can you explain this answer?
Rain drops fall from a height under gravity; we observe that :
a)
Their velocities go on increasing until they hit the ground but the velocity with which the
drops hit the ground differs with the radius of the rain drop
drops hit the ground differs with the radius of the rain drop
b)
Their velocities go on increasing until they hit the ground, velocity being independent of the radius of the drop
c)
They fall with a terminal velocity which is independent of the radius of the rain drop
d)
They fall with a terminal velocity which depends upon the radius of the rain drop
Jeeja Varshini asked • 1 hour agoA 20 volts A.C. is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12 V, the voltage across the coil is- a)16 volts
- b)10 volts
- c)8 volts
- d)6 volts
Correct answer is option 'A'. Can you explain this answer?
A 20 volts A.C. is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12 V, the voltage across the coil is
a)
16 volts
b)
10 volts
c)
8 volts
d)
6 volts
Surendra Bishnoi asked • 1 hour agoA satisfactory photographic print is obtained when the exposure time is 10 seconds at a distance of 2 m from a 60 Cd lamp. The time of exposure required for the same quality print at a distance of 4 m from a 120 Cd lamp is- a)5s
- b)10s
- c)25s
- d)20s
Correct answer is option 'D'. Can you explain this answer?
A satisfactory photographic print is obtained when the exposure time is 10 seconds at a distance of 2 m from a 60 Cd lamp. The time of exposure required for the same quality print at a distance of 4 m from a 120 Cd lamp is
a)
5s
b)
10s
c)
25s
d)
20s
Chinmay Shet asked • 1 hour agoIn spectral radiancy curve for cavity radiation, the wave-length of the maximum spectral rediancy- a)Increases with increasing temperature
- b)Decreases with increasing temperature
- c)Sometimes increases sometimes decreases with increasing temperature
- d)Remains unaffected by temperature variation
Correct answer is option 'B'. Can you explain this answer?
a)
Increases with increasing temperature
b)
Decreases with increasing temperature
c)
Sometimes increases sometimes decreases with increasing temperature
d)
Remains unaffected by temperature variation
Jyoti Aiims Aspirant asked • 2 hours agoEvery cell contains DNA and when we consume plant /animal material , the DNA which reaches our digestive tract is digested by :- a)enzymes present in pancreatic juice and gastric juice
- b)enzymes present in bile juice and gastric juice
- c)enzymes present in bile juice and succusentericus
- d)enzymes present in pancreatic juice and succus entericus
Correct answer is option 'D'. Can you explain this answer?
Every cell contains DNA and when we consume plant /animal material , the DNA which reaches our digestive tract is digested by :
a)
enzymes present in pancreatic juice and gastric juice
b)
enzymes present in bile juice and gastric juice
c)
enzymes present in bile juice and succusentericus
d)
enzymes present in pancreatic juice and succus entericus
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