passwella.
Menu

WAEC Biology 2019 Question 24

Question 24

Photosynthesis and Plant Nutrition

Light is excluded from a water culture experiment in order to

  1. A.prevent overheating of the roots.
  2. B.enable the roots to grow straight down.
  3. C.prevent ionization of water molecules.
  4. D.prevent the growth of algae.
Show the answer and explanation

Answer: D (prevent the growth of algae.)

Explanation

If light reaches the nutrient solution, algae grow in it and use up the minerals. Covering the culture bottle keeps light out and stops algae growing.