Question

Is thermal stratification, the middle region which shows vertical temperature change is called
a) mesolimnion
b) epilimnion
c) metalimnion
d) hypalimnion

Answer 1

Answer:

DEPENDING upon environmental condition it is more oxygenated than layers below it. The middle reason is called the metalimnion

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Answer 2

Answer:

Option c - Metalimnion.

Explanation:

• The water bodies are stratified into three different levels based on the amount of sunlight available to that layer.
• This is called thermal stratification.
• As there is variation in temperature at different depths in a lake and the change in the density of water along with the temperature, it is called thermal stratification.
• The topmost layer is called epilimnion. The pH of this layer is greater, because of more dissolved oxygen levels.
• At this level exchange of gases is easy as it is the uppermost layer.
• Middle layer is metalimnion. There is a drop in the temperature as the depth increases.
• The last layer is hypolimnion, this layer does not get any sunlight and has the coldest temperature.    

Hence, the middle layer is metalimnion.