Botany MCQs for NEET — Practice Questions with Answers

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Photorespiration in C3 plants starts from.

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Explanation

Photorespiration begins in the chloroplast, when rubisco attaches oxygen to RuBP in its oxygenase reaction. Two molecules are produced in this reaction: a three-carbon compound, 3-PGA, and a two-carbon compound, phosphoglycolate.

Who is that scientist who gave the Law of limiting factors ?

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Explanation

The Law of Limiting Factors was formulated by F. F. Blackman. This law states that the rate of a physiological process will be limited by the factor that is in the shortest supply. In the context of photosynthesis, this means that the rate can be limited by light intensity, carbon dioxide concentration, or temperature, depending on which is the least available or most restrictive at any given time.

How many electrons are involved for the formation of 1 mole of glucose and 6O2 molecules ?

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Stomata of CAM plants

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Explanation

CAM (Crassulacean Acid Metabolism) plants open their stomata at night to minimize water loss while allowing CO2 to enter for photosynthesis. During the day, the stomata are closed to conserve water. This adaptation is particularly useful in arid conditions.

One of the following is electron donor to Pd680d during light reactions photosynthesis

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Explanation

In the light reactions of photosynthesis, water (H2O) acts as the electron donor to Photosystem II (PSII), which contains P680 chlorophyll molecules. Water is split into oxygen, protons, and electrons through a process called photolysis. The electrons released from water replenish the electron deficit in P680 after it gets excited by light energy.

The reduction of ADP to ATP occurs by

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Explanation

The reduction of ADP to ATP in photosynthesis occurs through a process known as chemiosmosis, which involves a high concentration of H+ ions (protons) across the thylakoid membrane. This proton gradient drives ATP synthesis as protons flow back across the membrane through ATP synthase.

The process of ATP formation from ADP in the presence of light in chloroplast is called

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Explanation

The process of ATP formation from ADP in the presence of light in chloroplasts is called photophosphorylation. This process uses the energy from light to add a phosphate group to ADP, forming ATP, and it occurs in the thylakoid membranes of chloroplasts during the light reactions of photosynthesis.

__________ is the by product of photosynthesis.

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Explanation

O2 (oxygen) is the by-product of photosynthesis. During the light-dependent reactions of photosynthesis, water molecules are split (photolysis) to release oxygen, electrons, and protons. The oxygen is then released as a by-product.

Site of reduction of carbon is

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Explanation

The reduction of carbon occurs in the stroma of the chloroplast. This is where the Calvin cycle takes place, utilizing ATP and NADPH produced in the light-dependent reactions to fix carbon dioxide into organic molecules.

The products(s) of photophosphorylation that occurs mostly in stroma lamellae membrane of green plants is/are.

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Explanation

Cyclic photophosphorylation occurs mostly in stroma lamellae membrane and in this process, only ATP is released.

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