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Which of the following correctly lists factors that affect photosynthesis from inside the plant (internal factors)?

  • (a) leaf number and orientation, chloroplasts, internal CO2, chlorophyll content Correct
  • (b) water availability in the soil, soil type and soil temperature Your answer
  • (c) light intensity, CO2 in the air, temperature and water supply Your answer
  • (d) air humidity, wind speed, day length and season of the year Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

Internal factors include the number, size, age and orientation of leaves, mesophyll cells and chloroplasts, internal CO2 concentration and the amount of chlorophyll.

Why the other options are wrong

  • (b) · your answer Soil water and temperature are external factors.
  • (c) · your answer Light, CO2 in air, temperature and water are external factors.
  • (d) · your answer These are environmental (external) conditions.
NCERT point: Internal factors depend on the plant's genetic make-up and growth.
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