1 answer

Why is ATP synthesis in plants considered to be light-dependent? Choose the best answer for the...

Question:

Why is ATP synthesis in plants considered to be light-dependent? Choose the best answer for the question.

Light excites P700, driving electron transfer in photosystem I.

The oxidation of water at the manganese complex is light-dependent.

ATP synthesis in plants is part of the Z-scheme of photosynthesis, and is driven by the transfer of electrons in photosystem II and photsystem I.

The light-dependent reactions of photosynthesis set up the proton gradient that drives ATP synthsis.


Answers

Answer: The light-dependent reactions of photosynthesis set up the proton gradient that drives ATP synthsis.

Explanation: The light reactions of photosynthesis is called photolysis reactions. It converts solar energy into chemical energy in the form of NADPH and ATP.

There are two types of photosystems: Photosystem I and Photosystem II. Each has one primary photochemical reaction center (either chlorophyll P700 or P680) and a set of accessory pigments to absorb additional light.

Photosynthesis is initiated with the simultaneous excitation of pairs of special reaction center made of chlorophyll(a) molecules, and is called P680 (in photosystem II, or PSII) and P700 (in photosystem I, or PSI)

The Z-scheme represents the steps in the light reactions. It shows the pathway of electron transport from water to NADP+ (nicotinamide adenine dinucleotide phosphate). The process involves the release of oxygen, the "reduction" of NADP+ to NADPH and the build up of hydrogen ions within the thylakoid lumen.

This proton gradient drives ATP production.

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