Question

Which lake zone would be absent in a very shallow lake?

(A) benthic zone

(B) aphotic zone

(C) pelagic zone

(D) littoral zone

Short answer

(A) The option “benthic zone” is false.

(B) The option “aphotic zone” is true.

(C) The option “pelagic zone” is false.

(D) The option “littoral zone” is false.

Step-by-step solution

Lake

A lake is a large water body in which the moving or standing water is surrounded by land and formed by a land basin filled through precipitation.

Explanation of option ‘(A)’

The benthic zone is the bottommost layer of the ecological zone of a water body like ocean and lake with lower oxygen and temperature level.

Thus, the areas within a few centimeters of the benthic zone are considered as shallow.

Therefore, the given option is false.

Explanation of option ‘(B)’

The apothic zone is an area in the depths of a lake or ocean where where no sunlight can penetrate .

Thus, the aphotic zone is the area without light and which receives no light, but light penetrates in shallow lakes.

Therefore, the given option is true.

Explanation of option ‘(C)’

The pelagic zone is an ecological area that refers to an open sea with good oxygen content but poor nutrients and resources.

Thus, sunlight penetrates the top zone of the pelagic region.

Therefore, the given option is false.

Explanation of option ‘(D)’

In an aquatic ecosystem, the marine ecological area close to the shore is called the littoral zone.

Thus, sunlight penetrates all the way to the littoral zone.

Therefore, the given option is false.