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WAEC Biology 1991 (August) Question 19

Question 19

Plant Responses and Hormones

If a germinating seed is attached horizontally on a revolving klinostat, what will be the effect on the seedling after three days? The

  1. A.plumule will curve vertically upwards while the radicle will curve towards the ground
  2. B.plumule and radicle will not show any curvature
  3. C.radicle will curve towards the ground while the plumule will not show any curvature
  4. D.plumule will curve vertically upwards while the radicle will not show any curvature
  5. E.plumule and the radicle will curve towards the ground
Show the answer and explanation

Answer: B (plumule and radicle will not show any curvature)

Explanation

The rotation spreads the pull of gravity evenly on all sides, so both shoot and root grow straight.