JAMB Biology 1980 Question 30

Question 30

Transport in Plants

If the bark and phloem tissues of a woody shoot are peeled off by ringing, the whole plant will eventually die because

  1. A.water does not reach the leaves
  2. B.water and salts remain below the ringed portion
  3. C.there is a withdrawal of water from the root by soil
  4. D.manufactured food does not reach the roots
  5. E.the roots store too much water.
Show the answer and explanation

Answer: D (manufactured food does not reach the roots)

Explanation

Ringing removes the phloem, so food made in the leaves cannot reach the roots, which starve and die.