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The entire process of photosynthesis is driven by light energy coming from the sun. This energy is first captured by chlorophyll molecules and later on utilised for the synthesis of ATP (chemical energy) molecules which later utilised in the dark reaction i.e., calvin cycle.

1. Photosynthesis is driven by light energy from the sun.
2. Chlorophyll captures light energy.
3. ATP is synthesised during photosynthesis.
4. ATP is utilised in the Calvin cycle.

Correct answer: Photosynthesis is driven by light energy from the sun.

Solution

The passage says the entire process of photosynthesis is driven by light energy from the sun, making that the central idea. The other options are true details from the process, but they are narrower events rather than the main statement.

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