Question

Marine life like fish prefers to stay at lower level in water. Explain. 

OR

Explain, why do aquatic animals prefer to stay at lower level of water during summer?

Answer 1

1. The solubility of oxygen gas decreases with the increase in temperature. 

2. In sea or lake water, the temperature of upper level is higher than the lower level.

3. Therefore the dissolved oxygen content in water is more at lower level than at higher level required for the marine life.

Hence marine life like fish prefers to stay at lower level than upper level of water.