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Question

Aquatic plants use CO2 dissolved water for:


A

breakdown of toxic materials

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B

respiration

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C

excretion

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D

photosynthesis

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Solution

The correct option is D

photosynthesis


The explanation for the correct option:

(D) Photosynthesis: The process of conversion of light energy into chemical energy by plants, algae and certain bacteria using Carbon dioxide (CO2) and water.

6CO2(g)(Carbondioxide)+2H2O(Water)(l)SunlightC6H12O6(aq)(Glucose)+6O2(g)(Oxygen)+6H2O(l)(Water)

  • Carbon dioxide is present in water as a dissolved gas.
  • It has a high solubility in water and can dissolve in water 200 times more easily than oxygen.
  • Aquatic animals like fish depend on dissolved Oxygen (O2) gas whereas aquatic plants depend on dissolved carbon dioxide for life and growth.
  • Plants use this carbon dioxide dissolved in water for the process of photosynthesis.

The explanation for the incorrect options:

(A) Breakdown of toxic materials: It occurs using water or light and by the use of microbes that decompose the waste and toxic materials present in the environment.

(B) Respiration: It is a process of oxidation of food to release energy using Oxygen.

C6H12O6(aq(Glucose))+6O2(g)(Oxygen)6CO2(g)(Carbondioxide)+6H2O(l)(Water)+Energy

(C) Excretion: It is a process of removal of wastes from the body of animals.

Hence, option (D) is correct.


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