Chapter 3, Problem 30A

Summary Introduction

Introduction:

The sea is divided into many zones, depending on the resource distribution. On the basis of light, they are divided into photic and aphotic zone. The tidal zones can be low tide, intermediate tide and high tide zone. The littoral zone is the zone present near the shore, limnetic zone is the upper zone of the open sea and the profundal zone is the deep abyss zone of the deep sea.

Answer to Problem 30A

Correct Answer:

Option (B) limnetic zone.

Explanation of Solution

Explanation/justification for the correct answer:

Option (B) limnetic zone. The limnetic zone is the photic zone in the open sea. The effect of tides here is less. The limnetic zones are well lit and stable that provide the photosynthetic planktons to survive. Hence, it is the correct answer.

Explanation for incorrect answer:

Option (A) littoral zone. This zone has nutrients and the sunlight for planktons, but the water here is moving and unstable, and planktons cannot stay or long. Hence, it is an incorrect answer.

Option (C) profundal zone. The profundal zone does not have access to the light and the nutrients and oxygen are less here. Hence, it is not correct.

Option (D) aphotic zone. The aphotic zone lacks light and planktons needs light for photosynthesis. Hence, it is an incorrect answer.