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Which of the following is an internal (plant) factor affecting photosynthesis?

(a) temperature of the air Your answer
(b) number and age of leaves Correct
(c) intensity of sunlight Your answer
(d) CO₂ in the air Your answer

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

The number, size, age and orientation of leaves are internal (plant) factors affecting photosynthesis.

Why the other options are wrong

(a) · your answer Air temperature is an external factor.
(c) · your answer Sunlight is an external factor.
(d) · your answer Atmospheric CO₂ is an external factor.

NCERT point: Internal factors depend on the plant's genetic make-up and growth.

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