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WAEC Agricultural Science 1991 (August) Question 13

Question 13

Irrigation and Drainage

Most crop plants do not survive in water-logged soils because

  1. A.the dissolved nutrients are too diluted for crop plants
  2. B.the plants will not photosynthesize
  3. C.their leaves are turgid for respiration
  4. D.their physiological processes will be increased
  5. E.oxygen has been displaced leading to its deficiency for crops.
Show the answer and explanation

Answer: E (oxygen has been displaced leading to its deficiency for crops.)

Explanation

Water fills the air spaces, so roots lack oxygen for respiration and die.