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The first step in the initiation of photosynthesis is
Your answer:
Correct answer: (d)
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Explanation
Why (d) is correct
Photosynthesis begins when light is absorbed and chlorophyll molecules become excited. The excited reaction centre gives up electrons, and only then do photolysis of water, ATP formation and sugar formation follow.
Why the other options are wrong
- (a) · your answer Water is split to replace the electrons lost by PS II, which happens after the chlorophyll has been excited.
- (b) · your answer ATP is made later, using the proton gradient set up by electron transport.
- (c) · your answer Glucose is formed last, in the Calvin cycle.
NCERT point: Light absorption excites electrons in P680 and P700; these electrons pass along the electron transport chain.
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