Photosynthesis MCQs for NEET — Botany Questions with Answers

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In non-cyclic photophosphorylation

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Explanation

In non-cyclic photophosphorylation, light energy is used to produce ATP and NADPH. This process involves both photosystem I (PS-I) and photosystem II (PS-II). The electron flow is unidirectional, starting from water and ending at NADP+ to form NADPH. Therefore, all the given statements are correct.

In non-cyclic photophosphorylation, the electron emitted by Pd680d is replaced by electron from

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Explanation

In non-cyclic photophosphorylation, the electrons lost by P680 in photosystem II are replaced by electrons obtained from the splitting of water molecules (photolysis). This process releases oxygen and provides electrons to replenish the electron deficit in P680.

85-90% (9/10) of all photosynthesis in the world is carried out by

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Explanation

Algae in the oceans are responsible for a significant portion of global photosynthesis. They contribute to about 85-90% of the world's photosynthesis due to their vast numbers and widespread presence in the marine environment.

Primary and secondary processes of Photosynthesis takes place in_____ and ______ respectively.

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Explanation

The primary processes of photosynthesis, which involve light reactions, take place in the grana. The secondary processes, which include the Calvin cycle (dark reactions), occur in the stroma.

For synthesis of one molecule of glucose, the requirement of ATP and NADPHd2d is respectively

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Explanation

For the synthesis of one molecule of glucose during photosynthesis, 18 molecules of ATP and 12 molecules of NADPH are required. This is because six turns of the Calvin cycle are needed to produce one glucose molecule, and each turn uses 3 ATP and 2 NADPH.

Which of the following element is needed for chlorophyll biosynthesis?

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Explanation

Magnesium (Mg) is an essential element for the biosynthesis of chlorophyll. It is a central atom in the chlorophyll molecule and plays a crucial role in the absorption of light during photosynthesis. Without magnesium, plants cannot produce chlorophyll, which leads to a condition known as chlorosis.

The two enzymes responsible for primary carboxylation in Cd3d and Cd4d pathway, respectively are

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Action spectrum is

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Explanation

An action spectrum is a graph that shows the rate of photosynthesis at different wavelengths of light. It indicates which wavelengths are most effectively used in the process of photosynthesis. This is different from an absorption spectrum, which shows the absorption of light by pigments.

C40 H56 O2 is molecular formula of

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Explanation

Xanthophylls are oxygenated derivatives of carotenes and have the molecular formula C40H56O2. They are pigments found in plants and contribute to the yellow and orange colors in leaves.

Donor and acceptor of electrons is the same chlorophyll molecule in

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Explanation

In cyclic photophosphorylation, the same chlorophyll molecule acts as both the donor and acceptor of electrons. This process occurs in the thylakoid membrane of the chloroplast and is used to produce ATP without the production of NADPH or oxygen.

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