Bakers yeast is added to an aquarium for the following reason:
a) It provides minerals and metals.
b) It absorbs heavy metals present in the water and purifies it.
c) It helps the plants for photosynthesis through aerobic respiration.
d) It helps the plants for photosynthesis through anaerobic respiration.

A only

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C only

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B and C

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D only

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Solution

The correct option is D D only
Bakers yeast is a fungus is added to the aquarium which can perform anaerobic respiration. They do not require oxygen for respiration and release carbon dioxide as the end product of the reaction. The carbon dioxide can be used by the plants in the aquarium to perform photosynthesis and liberate oxygen which can be used by the aquatic animals.
Thus, the correct answer is option D.

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