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JAMB Biology 1988 Question 21

Question 21

Transport in Plants

If the phloem of a healthy plant is killed by heat treatment the

  1. A.upward movement of salts will cease
  2. B.food manufacture in the leaves will accumulate
  3. C.whole plant will die immediately
  4. D.leaves of the plant will become yellow
Show the answer and explanation

Answer: B (food manufacture in the leaves will accumulate)

Explanation

Phloem carries food made in the leaves to the rest of the plant; if it is killed, the food stays and builds up in the leaves.