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All questions of Subject Wise Mock Test for NEET Exam

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Melanocyte stimulating hormone(MSH) is secreted by pituitary
a)Posterior lobe
b)Anterior lobe
c)Median lobe
d)Not any particular lobe
Correct answer is option 'C'. Can you explain this answer?

Shalini Khanna answered
Melanocyte Stimulating Hormone (MSH) Secretion

Introduction:

Melanocyte Stimulating Hormone (MSH) is a hormone that is secreted by the pituitary gland. This hormone is responsible for regulating the production of melanin, a pigment that is responsible for the color of our skin, hair, and eyes.

Pituitary gland:

The pituitary gland is a small gland located at the base of the brain. It is divided into three different parts: the anterior lobe, the posterior lobe, and the median lobe.

MSH secretion:

MSH is secreted by the median lobe of the pituitary gland. This hormone is produced by cells called melanotrophs, which are located in the intermediate lobe of the pituitary gland.

Functions of MSH:

The main function of MSH is the regulation of melanin production. Melanin is responsible for the color of our skin, hair, and eyes. MSH stimulates the production of melanin, which gives our skin its color.

MSH also plays a role in the regulation of appetite and energy balance. It has been shown to reduce food intake and increase energy expenditure.

Conclusion:

In conclusion, MSH is a hormone that is secreted by the pituitary gland, specifically the median lobe. Its main function is the regulation of melanin production, which gives our skin its color. MSH also plays a role in the regulation of appetite and energy balance.

In root hair, water enters due to
  • a)
    Diffusion
  • b)
    W.P.
  • c)
    T.P.
  • d)
    O.P.
Correct answer is option 'D'. Can you explain this answer?

Ved Patidar answered
Yes u all are correct but diffusion is also correct answer but if mention special(effective) process then more correct answer is O.P.

Under constant temperature, graph between P and 1/V is a
  • a)
    Parabola
  • b)
    Hyperbola
  • c)
    Straight line
  • d)
    Circle
Correct answer is option 'C'. Can you explain this answer?

Lekshmi Roy answered
I am an AI language model designed by OpenAI to provide responses to user queries and generate human-like text. I can assist with a wide range of tasks, such as answering questions, translating languages, summarizing text, writing essays, and more. I use machine learning algorithms and natural language processing techniques to understand and generate text based on the input provided to me.

An allele is dominant if it is expressed in
A: Both homozygous and heterozygous states
B: second generation
C: Heterozygous combination
D: Homozygous combination
Correct answer is option 'A'. Can you explain this answer?

Sathvika Tadri answered
If the allele expresses in both it's homozygous and heterozygous condition..it is dominant....whereas reccesive allele can be expressed only in homozygous condition

Which of the following do not require medium for transmission
  • a)
    Cathode ray
  • b)
    Electromagnetic wave
  • c)
    Sound wave
  • d)
    None of the above
Correct answer is option 'B'. Can you explain this answer?

Nirosha Niro answered
Electromagnetic waves are not mechanical waves.they are vibrations of electric and magnetic vectors in them..they do not need any particles in medium for their propagation.

Can you explain the answer of this question below:
Of the processes which occur in leaves, the one which may lower their temperature (cooling effect)is
  • A:
    Respiration
  • B:
    Photosynthesis
  • C:
    Transpiration
  • D:
    Hydrolysis

The answer is c.

Vijay Bansal answered
Higher temperatures cause the plant cells which control the openings (stoma) where water is released to the atmosphere to open, whereas colder temperatures cause the openings to close. Relative humidity: As the relative humidity of the air surrounding the plant rises the transpiration rate falls.

Midgets are due to the deficiency of
  • a)
    Pituitary
  • b)
    Adrenal
  • c)
    Pancreas
  • d)
    Thyroid
Correct answer is option 'A'. Can you explain this answer?

Ananya Das answered
  • Midgets is also called pituitary dwarfism. Midget is a term for a person of unusually short stature.
  • When the hypothalamus releases growth hormone releasing hormone (GHRH), the anterior pituitary is stimulated to release growth hormone (GH).
  • Growth hormone then acts on the liver and other tissues and stimulates them to secrete insulin like growth factor-1 (IGF-1). IGF-1 directly promotes the development of bone and muscle, causing bones to grow in length, and muscles to increase protein synthesis.
  • Hence, an absence of growth hormone will cause dwarfism or midgets.

Meiosis occurs in
  • a)
    Embryo sac
  • b)
    Megaspore
  • c)
    Megaspore mother cell
  • d)
    Nucellus
Correct answer is option 'C'. Can you explain this answer?

Avantika Nambiar answered
Meiosis occurs in the Megaspore Mother Cell.

Explanation:
Meiosis is a type of cell division that occurs in sexually reproducing organisms. In plants, meiosis occurs during the formation of gametes, which are haploid cells that fuse during fertilization to form a diploid zygote. In angiosperms, meiosis occurs in the megaspore mother cell, which is located inside the ovule.

The ovule is a structure that contains the megasporangium, which is the site of meiosis. The megaspore mother cell undergoes meiosis to produce four haploid cells, one of which will become the functional megaspore. The other three cells typically degenerate.

The functional megaspore undergoes mitotic divisions to produce the female gametophyte, which contains the egg cell and other cells that are involved in fertilization. The female gametophyte is also called the embryo sac.

Therefore, the correct answer is option C, Megaspore Mother Cell.

Photosystem-II takes place in
A: stroma
B: grana
C: entire chloroplast
D: chloroplast membrane
Correct answer is option 'B'. Can you explain this answer?

Payal Sinha answered
PS II occurs mostly on the granal lamellae of the chloroplast. PS II uses light energy for photolysis of H2O molecules, or oxidizing H2O molecules producing electrons, protons (H+) and O2.

A plant with both male and female flowers borne over it is
  • a)
    Monoecious
  • b)
    Dioecious
  • c)
    Unisexual
  • d)
    Bisexual
Correct answer is option 'A'. Can you explain this answer?

Anjali Iyer answered
Monoecious” is translated as “single house,” meaning that male and female flowers are found on a single individual. This contrasts with the translation of dioecious, which is “double house.” This means that male flowers are on one plant and female flowers are on another plant.

A gun fires a bullet of mass 50 gm with a velocity of 30 ms-1. Because of this the gun is pushed back with a velocity of 1 ms-1. Mass of the gun is
  • a)
    1.5Kg
  • b)
    30Kg
  • c)
    15Kg
  • d)
    20Kg
Correct answer is option 'A'. Can you explain this answer?

Sinjini Yadav answered
Solution:

Given: mass of bullet (m) = 50 gm = 0.05 kg, velocity of bullet (u) = 30 ms-1, velocity of gun (v) = 1 ms-1.

Let the mass of the gun be 'M'. According to the principle of conservation of momentum:

Initial momentum = Final momentum

The initial momentum is zero since the gun and bullet were at rest initially. The final momentum can be calculated as follows:

Final momentum = (mass of bullet × velocity of bullet) + (mass of gun × velocity of gun)

Final momentum = (0.05 kg × 30 ms-1) + (M × 1 ms-1)

Final momentum = 1.5 kg ms-1 + M ms-1

Therefore, according to the principle of conservation of momentum:

0 = 1.5 kg ms-1 + M ms-1 - M × 1 ms-1

0 = 1.5 kg ms-1

M = 1.5 kg

Therefore, the mass of the gun is 1.5 Kg. Hence, the correct option is (a).

When aluminium phosphide is treated with dil. sulphuric acid
  • a)
    SO₂ is liberated
  • b)
    PH₃ is evolved
  • c)
    H₂O is evolved
  • d)
    H₂ is evolved
Correct answer is option 'B'. Can you explain this answer?

Maulik Chakraborty answered
Explanation:

Aluminium phosphide is a highly toxic, colorless, and flammable gas that is used as a fumigant for stored grain and other agricultural products. When it is treated with dilute sulfuric acid, the following reaction takes place:

AlP + 3H2SO4 → Al2(SO4)3 + 3H3PO4 + PH3

The main product of this reaction is phosphine gas (PH3), which is highly toxic and can cause severe respiratory and neurological effects if inhaled. The other products of the reaction are aluminum sulfate (Al2(SO4)3) and phosphoric acid (H3PO4).

The reaction can be explained in terms of the reactivity of aluminum phosphide and the acidity of sulfuric acid. Aluminum phosphide is a reactive compound that readily reacts with acids to produce phosphine gas. Sulfuric acid is a strong acid that can donate protons to the aluminum phosphide, leading to the formation of aluminum sulfate and phosphoric acid. The phosphoric acid can further react with the remaining sulfuric acid to form more aluminum sulfate and water.

In summary, when aluminum phosphide is treated with dilute sulfuric acid, phosphine gas is evolved as the main product, along with aluminum sulfate and phosphoric acid. It is important to handle aluminum phosphide and its derivatives with caution, as they are highly toxic and pose a significant risk to human health and the environment.

An organic compound X give a red precipitate on heating with Fehling's solution. Which one of the following reactions yields X as a major product?
  • a)
  • b)
  • c)
  • d)
Correct answer is option 'D'. Can you explain this answer?

Ramakrishna Sarlana answered
Fehlings test is given by aldehydes the only option which gives aldehyde is option D.so,the correct answer is option D.In option A) primary alcohol is formed and In option B)ethyl alcohol is formed and In option C) dieťhyl ether is formed.

Blockages in which of the following blood vessels reduces blood flow to the heart muscle?
  • a)
    Aorta
  • b)
    Carotid artery
  • c)
    Coronary artery
  • d)
    Pulmonary artery
Correct answer is option 'C'. Can you explain this answer?

Srestha Mehta answered
Coronary Artery Blockage and Reduced Blood Flow to the Heart Muscle

Coronary arteries are the blood vessels that supply oxygen-rich blood to the heart muscle. When these arteries become blocked or narrowed due to plaque buildup, it can lead to reduced blood flow to the heart muscle, which can result in chest pain (angina), heart attack, or even death.

Explanation:

• Aortais the largest artery in the body that carries oxygen-rich blood from the heart to the rest of the body. Blockages in the aorta can cause problems in different parts of the body and not specifically to the heart muscle.

• Carotid artery is a major blood vessel that supplies blood to the brain, face, and neck. Blockages in the carotid artery can lead to stroke or transient ischemic attack (TIA), but they do not affect the blood flow to the heart muscle.

• Pulmonary artery carries deoxygenated blood from the heart to the lungs for oxygenation. Blockages in the pulmonary artery can cause pulmonary embolism or other lung-related problems, but they do not affect the blood flow to the heart muscle.

• Coronary artery supplies oxygen-rich blood to the heart muscle. When these arteries become blocked or narrowed due to plaque buildup (atherosclerosis), it can cause reduced blood flow to the heart muscle. This condition is known as coronary artery disease (CAD).

• CAD can cause chest pain (angina), shortness of breath, heart attack, or even death. Risk factors for CAD include smoking, high blood pressure, high cholesterol, diabetes, family history, and a sedentary lifestyle.

Conclusion:

Thus, blockages in the coronary artery reduce blood flow to the heart muscle, which can lead to various heart-related problems. It is essential to maintain a healthy lifestyle and manage risk factors to prevent or manage coronary artery disease.

Eight dipoles of charges of magnitude are placed inside a cube. The total electric flux coming out of the cube will be
  • a)
    zero
  • b)
    q/ε₀
  • c)
    8q/ε₀
  • d)
    16q/ε₀
Correct answer is option 'A'. Can you explain this answer?

Imk Pathsala answered
Explanation:

 

  • Electric Flux: The electric flux through a closed surface is given by the total electric field passing through that surface.

  • Gauss's Law: According to Gauss's Law, the total electric flux through a closed surface is equal to the total charge enclosed by that surface divided by the permittivity of free space (ε₀).

  • Given Situation: In this case, there are eight dipoles of charges inside a cube. Since dipoles consist of equal and opposite charges separated by a distance, the total charge enclosed by the cube is zero.

  • Total Electric Flux: Therefore, the total electric flux coming out of the cube is zero as there is no net charge enclosed.

  • Therefore, the correct answer is A: zero.


    •  

Which part of the reproductive structure produces both enzymes and hormones?
  • a)
    Archegonium
  • b)
    Middle layer
  • c)
    Tapetum
  • d)
    Endothecium
Correct answer is option 'C'. Can you explain this answer?

Rajni Kokate answered
Tapetum synthesizes callase enzyme which dissolves callose. it produces many hormones ,amino acids and nutritious substances that are needed for pollen grains.

Which is the chiral molecule?
  • a)
    CH₃Cl
  • b)
    CH₂Cl₂
  • c)
    CHBr₃
  • d)
    CHClBrI
Correct answer is option 'D'. Can you explain this answer?

Sathvika Tadri answered
CHClBrI is a chiral molecule as all the four groups attached to the carbon are diff...option D

The winged pollen grains of Pinus sp. are produced in-
  • a)
    Pollen chamber
  • b)
    Tapetum
  • c)
    Anther
  • d)
    Microsporangium
Correct answer is option 'D'. Can you explain this answer?

Kaneez Fatima answered
These pollen grains or microgametophytes are born through meiotic division of the microsporocytes or pollen mother cells within the microsporangium.

During DNA replication, the strands separate by
  • a)
    DNA polymerase
  • b)
    Topoisomerase
  • c)
    Unwindase/Helicase
  • d)
    Gyrase
Correct answer is option 'C'. Can you explain this answer?

Smrity answered
Helicase is enzyme which uses energy and break the hydrogen bonds and create replication fork. and hence separate DNA strands.

Benzene is used in the preparation of
  • a)
    Polythene
  • b)
    Gammaxene
  • c)
    Chloroform
  • d)
    Vinegar
Correct answer is option 'B'. Can you explain this answer?

Krithika Sharma answered
Benzene is a cyclic hydrocarbon with the formula C6H6. It is a colorless and highly flammable liquid with a sweet odor. Benzene is extensively used in the chemical industry as a solvent, as a starting material for the synthesis of various chemicals, and as a raw material for the manufacture of plastics, synthetic fibers, rubber, dyes, and pharmaceuticals.

Preparation of Gammaxene from Benzene:

Gammaxene is a type of insecticide that is derived from benzene. It is prepared by the following steps:

1. Nitration: Benzene is first nitrated with a mixture of concentrated nitric and sulfuric acids to form nitrobenzene (C6H5NO2).

2. Reduction: The nitro group in nitrobenzene is then reduced by using metallic zinc and hydrochloric acid to form aniline (C6H5NH2).

3. Diazotization: Aniline is diazotized with sodium nitrite and hydrochloric acid to form diazonium chloride.

4. Coupling: The diazonium chloride is then coupled with gamma-resorcylaldehyde to form gammaxene (C18H12O2N2).

Thus, benzene is used in the preparation of gammaxene by a series of chemical reactions.

Which of the following type of reproduction occurs in sponges?
  • a)
    Fission
  • b)
    Budding
  • c)
    Fragmentation
  • d)
    None of these
Correct answer is option 'C'. Can you explain this answer?

Vandana Chakraborty answered
Fragmentation is the type of reproduction that occurs in sponges.

Explanation:
Sponges are multicellular aquatic animals that belong to the phylum Porifera. They are sessile and exhibit a wide range of body forms. Sponges reproduce both sexually and asexually. Asexual reproduction in sponges can occur by fragmentation.

In fragmentation, a sponge breaks up into small pieces due to physical disturbances such as wave action or predation. These small pieces are called fragments, and each fragment is capable of regenerating into a complete individual sponge. The process of regeneration involves the reorganization of the cells and tissues of the fragment into a new sponge.

Fragmentation is a common mode of reproduction in sponges, especially in species that have a high degree of flexibility and can withstand physical disturbances. It allows sponges to colonize new areas quickly and efficiently.

In addition to fragmentation, sponges can also reproduce asexually by budding, which involves the development of new individuals from outgrowths of the parent sponge. However, budding is less common in sponges than fragmentation.

Overall, fragmentation is the primary mode of asexual reproduction in sponges, and it plays an important role in their ecology and evolution.

Which conformation for ethane has the lowest potential energy?
  • a)
    eclipsed
  • b)
    staggered
  • c)
    skew
  • d)
    all have equal Potential Energy
Correct answer is option 'B'. Can you explain this answer?

Vandana Yadav answered
Explanation:

Ethane is a hydrocarbon that consists of two carbon atoms and six hydrogen atoms. The carbon-carbon bond in ethane is a single bond, which allows for free rotation around the axis of the bond. This free rotation leads to different conformations of ethane, which are defined by the orientation of the hydrogen atoms relative to each other.

The three most common conformations of ethane are eclipsed, staggered, and skew. The potential energy of each conformation is related to the repulsion between the electron clouds of the atoms in the molecule.

Staggered conformation has the lowest potential energy:

The staggered conformation is the most stable conformation of ethane. In this conformation, the hydrogen atoms on one carbon atom are oriented in the opposite direction to the hydrogen atoms on the other carbon atom. This orientation leads to the lowest possible electron cloud repulsion between the two carbon atoms.

Eclipsed conformation has higher potential energy:

The eclipsed conformation is the least stable conformation of ethane. In this conformation, the hydrogen atoms on one carbon atom are oriented directly above the hydrogen atoms on the other carbon atom. This orientation leads to the highest possible electron cloud repulsion between the two carbon atoms.

Skew conformation has intermediate potential energy:

The skew conformation is an intermediate conformation between the staggered and eclipsed conformations. In this conformation, the hydrogen atoms on one carbon atom are oriented at a 60-degree angle to the hydrogen atoms on the other carbon atom. This orientation leads to an intermediate level of electron cloud repulsion between the two carbon atoms.

Conclusion:

In conclusion, the staggered conformation has the lowest potential energy because it has the lowest electron cloud repulsion between the two carbon atoms. The eclipsed conformation has the highest potential energy because it has the highest electron cloud repulsion between the two carbon atoms. The skew conformation has an intermediate potential energy because it has an intermediate level of electron cloud repulsion between the two carbon atoms.

The IUPAC name of the compound having the molecular formula Cl₃C-CH₂CHO is
  • a)
    3,3,3-Trichloropropanal
  • b)
    1,1,1-Trichloropropanal
  • c)
    2,2,2-Trichloropropanal
  • d)
    Chloral
Correct answer is option 'A'. Can you explain this answer?

Sai Nikhil answered
According to the IUPAC nomenclature we give preference to the functional group so no. should be from right to left at 1st position CHO gp mean aldehyde give 'al'at last position 3C so propanal at 3rd position cl go is present so name is''3,3,3trichloropropanal

Mitosis can be studied in
  • a)
    Onion root tip
  • b)
    Garlic root tip
  • c)
    Tendril tip
  • d)
    All the above
Correct answer is option 'D'. Can you explain this answer?

Priya Menon answered
► Cell division is the basic requirement for the growth and development of the body, if the cells top dividing the body will eventually die.
There are two types of cell divisions:
  • One occurs in the gamete cell and is necessary for reproduction as this cell division leads to genetic material exchange, this is meiosis or the reductional division.
  • The other one is mitosis also known as Equational division which occurs in the somatic cells of the body and this cell division is employed in the repair of the body and increasing the number of cells for growth and development.
► In plants, mitosis occurs in the meristems which have the ability to divide continuously.
Meristems in plants are of two types:
  • Apical meristems which are present on the tips of roots and shoots and they help in the elongation of length of the plant.
  • The other is lateral meristem which helps in increasing the width of the plant.
Plants don’t repair or replace their damaged parts like leaves, branches but for new ones due to the continuous production of new cells in the meristems.
Mitosis in Onion Root Tips:

If only 2% of the main current is to be passed through a galvanometer of resistance G, then the resistance of shunt will be
  • a)
    G/50
  • b)
    G/49
  • c)
    50 G
  • d)
    49 G
Correct answer is option 'B'. Can you explain this answer?

Riya Banerjee answered
Let total current through the circuit be I.
Then, 0.02I current is to be passed through galvanometer of resistance G.
Let the resistance of shunt is Rs . 
∵ Shunt are in parallel combination with Galvanometer.
∴ 0.02I X G = (1 - 0.02)I X Rs 
⇒0.02G = 0.98 X Rs 
⇒Rs = 0.02G/0.98 = G/49 
Hence answer is G/49

Water falls from a height of 210 m. Assuming whole of energy due to fall is converted into heat the rise in temperature of water would be (J = 4.3 Joule/cal)
  • a)
    42oC
  • b)
    49oC
  • c)
    0.49oC
  • d)
    4.9oC
Correct answer is option 'C'. Can you explain this answer?

Stuti Sen answered
Given:
Height of water fall, h = 210 m
Energy due to fall is converted into heat.
J = 4.3 Joule/cal

To find: Rise in temperature of water

Solution:
The potential energy of water at height h is given by the formula,

Potential Energy = mgh

where m is the mass of water, g is the acceleration due to gravity and h is the height of water fall.

According to the question, the potential energy of water is converted into heat energy. The heat energy required to raise the temperature of water by ΔT is given by the formula,

Heat Energy = mCΔT

where C is the specific heat capacity of water.

Equating the potential energy and heat energy, we get

mgh = mCΔT

Simplifying the above equation, we get

ΔT = gh/C

Substituting the given values, we get

ΔT = (210 x 9.8)/(1 x 4.3 x 10^3)

ΔT = 0.49°C

Therefore, the rise in temperature of water is 0.49°C.

Hence, option C is the correct answer.

The current flowing through a wire depends on time as I = 3t2 + 2t +5. The charge flowing through the cross-section of the wire in time from t = 0 to t = 2 sec. is
  • a)
    22C
  • b)
    20C
  • c)
    18C
  • d)
    5C
Correct answer is option 'A'. Can you explain this answer?

Top Rankers answered
Explanation:

Given:
- Current flowing through the wire: I = 3t2 + 2t + 5
- Time interval: t = 0 to t = 2 sec

Charge Flowing Through the Cross-Section of the Wire:
- The charge flowing through the wire is given by the integral of current with respect to time.
- Q = ∫(3t2 + 2t + 5) dt
- Q = [t3 + t2 + 5t] evaluated from t = 0 to t = 2 sec
- Q = [(2)3 + (2)2 + 5(2)] - [(0)3 + (0)2 + 5(0)]
- Q = [8 + 4 + 10] - [0 + 0 + 0]
- Q = 22 C

Therefore, the charge flowing through the cross-section of the wire from t = 0 to t = 2 sec is 22 Coulombs. Hence, the correct answer is A: 22C.

During which phase of meiosis homologous chromosomes separate ?
  • a)
    metaphase-I
  • b)
    anaphase-I
  • c)
    prophase-II
  • d)
    telophase-II
Correct answer is option 'B'. Can you explain this answer?

Jyoti Sengupta answered
Answer: B. Anaphase-I

Explanation:
During meiosis, homologous chromosomes separate during Anaphase-I. Meiosis is a two-step process, consisting of Meiosis I and Meiosis II.

Meiosis I:
- Prophase-I: Chromosomes condense, homologous chromosomes pair up, and crossing over occurs between non-sister chromatids.
- Metaphase-I: Homologous chromosome pairs align at the equatorial plate.
- Anaphase-I: Homologous chromosomes separate and move towards opposite poles of the cell.
- This is the phase where the answer lies, as homologous chromosomes separate during this phase.
- Telophase-I: Chromosomes reach the poles of the cell, nuclear envelope reforms, and the cell divides into two daughter cells.

Meiosis II:
- Prophase-II: Chromosomes condense again, and the nuclear envelope breaks down.
- Metaphase-II: Individual chromosomes align at the equatorial plate.
- Anaphase-II: Sister chromatids separate and move towards opposite poles of the cell.
- Telophase-II: Chromatids reach the poles of the cell, nuclear envelope reforms, and the cells divide, resulting in four genetically unique haploid cells.

Muscles immune to fatigue are
  • a)
    Cardiac
  • b)
    Eye muscles
  • c)
    Unstriated
  • d)
    Skeletal
Correct answer is option 'A'. Can you explain this answer?

Geetika Shah answered
Cardiac muscle resists fatigue so well because it's got more mitochondria than skeletal muscle. With so many power plants at its disposal, the heart doesn't need to stop and chill out. It also has a steady supply of blood bringing it oxygen and nutrients.

Light energy is changed to chemical energy in the process of
  • a)
    Bioluminescence
  • b)
    Photosynthesis
  • c)
    Both A and B
  • d)
    Photorespiration
Correct answer is option 'B'. Can you explain this answer?

Debanshi Pillai answered
Photosynthesis is the process by which plants, algae, and some bacteria convert light energy into chemical energy that can be used to fuel cellular activities. It is the only process by which carbon dioxide is removed from the atmosphere and oxygen is released into the environment.

The process of photosynthesis can be broken down into two stages:

1. Light-dependent reactions: In this stage, light energy is absorbed by pigments such as chlorophyll and converted into chemical energy in the form of ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate). These energy-rich molecules are used to power the next stage of photosynthesis.

2. Light-independent reactions: In this stage, also known as the Calvin cycle, carbon dioxide is fixed into organic molecules such as glucose using the energy stored in ATP and NADPH. This process occurs in the stroma of the chloroplasts and does not require light.

Therefore, the correct answer to the given question is option B, photosynthesis. Bioluminescence is a different process in which living organisms produce light through chemical reactions. Photorespiration is a process that occurs in plants when there is a shortage of carbon dioxide and excess oxygen in the environment. It is not related to the conversion of light energy into chemical energy.

Cellular structure which always disappears during mitosis and meiosis is
  • a)
    Plastids
  • b)
    Nucleolus and nuclear envelope
  • c)
    Plasma membrane
  • d)
    None of the above
Correct answer is option 'B'. Can you explain this answer?

Hansa Sharma answered
Explanation:The correct answer is B: Nucleolus and nuclear envelope. During mitosis and meiosis, the cellular structure that always disappears is the nucleolus and nuclear envelope. This is because these structures need to break down to allow the chromosomes to separate and be distributed to the new cells formed during cell division.Here's a brief overview of their roles and what happens during cell division:Nucleolus:- It is a small, dense structure within the nucleus of a cell.- Its primary function is to produce ribosomes, which are essential for protein synthesis.- During the prophase of mitosis and meiosis, the nucleolus disassembles, and its components are dispersed throughout the cell.Nuclear envelope:- It is a double membrane that surrounds the nucleus of a cell.- It separates the genetic material within the nucleus from the cytoplasm of the cell.- During the prophase of mitosis and meiosis, the nuclear envelope breaks down, allowing the chromosomes to be accessed by the spindle fibers that will separate them during cell division.In summary, the nucleolus and nuclear envelope are cellular structures that always disappear during mitosis and meiosis to facilitate the process of cell division.

The most stable hydride is
  • a)
    NH₃
  • b)
    PH₃
  • c)
    AsH₃
  • d)
    SbH₃
Correct answer is option 'A'. Can you explain this answer?

Raiyan Zaib answered
See---


is the most stable hydride among the hydrides of group 15 elements because the strength of E-H (Here E = N, P, As, Sb, or Br) bond decreases down the group due to increase in size of the central atom

es NH3 is more basic than PH3 as NH3 has more density of electron. Owing it to the small size of nitrogen and small P orbitals it has the ability to form stronger bonds due to effective overlap. In PH3 however, the large size of P results in the P orbitals becoming diffused preventing effective

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