Discover Biology (Sixth Core Edition)
Discover Biology (Sixth Core Edition)
6th Edition
ISBN: 9780393936735
Author: Anu Singh-Cundy, Gary Shin
Publisher: W. W. Norton & Company
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Chapter 24, Problem 1SQ
Summary Introduction

Concept introduction: Energy is the strength needed for the sustained physical or mental activity. The organisms can be either producers or consumers in the basis of energy flow through an ecosystem. Producers capture the energy from the sunlight for the photosynthesis process. Energy is lost from the ecosystem as metabolic heat.

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Answer to Problem 1SQ

Correct answer: The amount of energy captured by photosynthesis, minus the amount lost as metabolite heat, is net primary productivity. Therefore, option c. is correct.

Explanation of Solution

Reason for the correct statement:

The amount of the energy which is captured by the phototroph minus the amount, it expends on cellular respiration and other process is called net primary productivity.

Option c. is given as “net primary productivity”. As net primary productivity is the energy captured by photosynthesis minus the amount lost as metabolic heat. Therefore, option c. is correct.

Reasons for the incorrect statement:

Option a. is given as “primary consumption”. Primary consumption is the amount of energy consumed by the primary consumers. Therefore, option a. is incorrect.

Option b. is given as “consumer efficiency”. Consumer efficiency is the amount of energy an organism utilized from the organism it consumed. Therefore, option b. is incorrect.

Option d. is given as “photosynthetic efficiency”. The fraction of light energy that is converted to chemical energy in the photosynthesis process is called photosynthetic efficiency. Therefore, option d. is incorrect.

Hence, options a., b., and d. are incorrect.

Conclusion

Net primary productivity is the energy captured by photosynthesis minus the amount of energy lost as metabolic heat.

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