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JAMB Biology 1989 Question 18

Question 18

Respiration

If a healthy potted plant is continuously kept in dim light

  1. A.the rate of respiration may equal that of photosynthesis
  2. B.more carbondioxide and water are taken in
  3. C.respiration may be halted
  4. D.the volume of oxygen released increases
Show the answer and explanation

Answer: A (the rate of respiration may equal that of photosynthesis)

Explanation

In dim light photosynthesis slows until it just balances respiration (the compensation point), so no extra food or oxygen is produced.