Question

Aquatic plants use ${CO}_2$ dissolved in water for :

• A. breakdown of toxic materials
• B. respiration
• C. excretion
• D. photosynthesis

Answer 1

The correct option is D photosynthesis

The aquatic plants utilize the dissolved carbon dioxide to prepare their own food in the form of carbohydrates by photosynthesis. This process also releases oxygen which is then by aquatic animals and plants for respiration.

${CO}_2+H_{2}O⟶O_2+C_6{H}_{12}{O}_6$

Fish and aquatic animals cannot split oxygen from water ($H_{2}O$) or other oxygen-containing compounds. Only green plants and some bacteria can do that through photosynthesis and similar processes.

Hence, the correct option is $D$