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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

A keystone species:

a. is usually a primary producer.

b. has a critically important role in determining the species composition of its community.

c. is always a predator.

d. usually reduces the species diversity in a community.

e. usually exhibits aposematic coloration.

Summary Introduction

Introduction:

The ecosystem is comprised of various levels at which every organism has a role to play. The energy gets transferred at every level of the pyramid of biomass. Therefore, there is a keystone species, which has inordinately larger effect on the environment relative to its abundance. They have a very crucial role and without them the existence of ecosystem would be difficult.

Explanation

Justification/explanation for the correct answer:

Option (b) states that it has a critically important role in determining the species composition of its community. The keystone species has a crucial role to play in the ecosystem irrespective of its disproportionately huge effect on its environment. Some of the keystone species are also apex predators. Apex predators are the ones who occupy the top level of the food chain. Whether it is plants or animals, without keystone species existence of ecosystem would be difficult. Hence, option (b) is correct.

Explanation for the incorrect answers:

Option (a) states that it is usually a primary producer. It is not mandatory that keystone species has to be a primary producer. Animals like wolf are keystone species but are not primary producers. So, it is an incorrect option...

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