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Assertion: The higher concentration of O2 in the atmosphere is inhibitory to photosynthesis.

Reason: CO2 is the main substrate of photosynthesis.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.

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