passwella.
Menu

WAEC Biology 2013 Question 9

Question 9

Plant Responses and Hormones

What happens to a plant if the shoot tip is cut off and replaced by an agar block containing auxin? It will

  1. A.stop growing.
  2. B.grow rapidly.
  3. C.continue to grow normally.
  4. D.die completely.
Show the answer and explanation

Answer: C (continue to grow normally.)

Explanation

The shoot tip makes auxin, which causes cells below it to elongate. Auxin from the agar block replaces it, so growth continues as normal.