Biology: The Dynamic Science (Mind...

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



Biology: The Dynamic Science (Mind...

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

Some freshwater and marine ecosystems exhibit an invertedpyramid of:

a. biomass.

b. energy.

c. numbers.

d. turnover.

e. ecological efficiency.

Summary Introduction


The ecological pyramid is a graphical representation showing trophic levels in an ecosystem as stacked blocks, with primary producers at the bottom and high-level consumers at the top. These pyramids are used to represent the number, biomass, or energy in the entire ecosystem. The size of the blocks corresponds to the biomass, energy, or number of organisms at that level. Generally, the energy and productivity decrease with each trophic level.


Justification/explanation for the correct answer:

Option (a) is given as biomass. Some freshwater and marine ecosystems exhibit an inverted pyramid of biomass because in open water bodies, like lakes and oceans, the consumers are tiny animals that feed on plants, which are the primary producers. Thus, the biomass of the consumers becomes more than that of the primary producers as one moves toward the high trophic levels, thus giving an inverted shape to the pyramid of biomass. Hence, option (a) is correct.

Explanation for the incorrect answers:

Option (b) is given as energy. This is incorrect because the transfer of energy decreases with each trophic level as the producers use some energy for respiration and the consumers use some energy for their bodily functions, which reduces the amount of energy in each trophic level. Thus, freshwaters and marine ecosystems do not exhibit an inverted pyramid of energy...

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Additional Science Solutions

Find more solutions based on key concepts

Show solutions add

What impact has recombinant DNA technology had on genetics and society?

Human Heredity: Principles and Issues (MindTap Course List)

A benefit to health is seen when is used in place of in the diet. a. saturated fat/mono unsaturated fat b. satu...

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

In Example 11.8, we investigated an elastic collision between a disk and a stick lying on a frictionless surfac...

Physics for Scientists and Engineers, Technology Update (No access codes included)