Chapter 3, Problem 31A

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.

Answer to Problem 31A

Correct Answer:

Option (C) The communities are stratified from high tide and low tide line.

Explanation of Solution

Explanation/justification for the correct answer:

Option (C) The communities are stratified from high tide and low tide line. The intermediate tide zones have both low tide and high tides zone. Due to presence of both type of zone, the communities in the intermediate zone the communities in this zone are divided in high and low tides.

Explanation for incorrect answer:

Option (A) The dominant low-energy community is likely to be an estuary. The intertidal zones do not have a mixing of fresh water. Hence, it is an incorrect answer.

Option (B) The communities are adapted to shifting sands due to incoming line. The low tides zones have low movements of the sand and the zones that experience high tides have an adaptation of sand shifting. Hence, it is not correct.

Option (D) The organisms in the community require dissolved oxygen. Some of the organism in the intertidal zones require more oxygen and some of them require less oxygen. Hence, it is an incorrect answer.