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Which of the following is an external factor affecting photosynthesis?

  • (a) number of chloroplasts Your answer
  • (b) leaf age Your answer
  • (c) temperature Correct
  • (d) amount of chlorophyll Your answer
Your answer: Correct answer: (c)
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Explanation

Why (c) is correct

Temperature is an external (environmental) factor. Light, CO2 and water are other external factors.

Why the other options are wrong

  • (a) · your answer The number of chloroplasts is an internal (plant) factor.
  • (b) · your answer Leaf age is an internal factor.
  • (d) · your answer Chlorophyll amount is an internal factor.
NCERT point: NCERT lists internal factors (leaves, mesophyll, chloroplasts, CO2 inside, chlorophyll) and external factors (light, temperature, CO2, water).
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