EBK BIOLOGY
EBK BIOLOGY
4th Edition
ISBN: 8220102797376
Author: BROOKER
Publisher: YUZU
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Chapter 59, Problem 1TY
Summary Introduction

Introduction: Photosynthesis is a process in which the primary producers convert the sunlight and chemical molecules into usable forms of energy. This usable form of energy is stored in organic compounds, such as sugars. The primary producers convert carbon dioxide and water into glucose. The more synthesis of sugar leads to the accumulation of more biomass.

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Answer to Problem 1TY

Correct answer: The amount of energy that is fixed during photosynthesis is known as “gross primary productivity”. Hence, the correct answer is option d.

Explanation of Solution

Reason for correct answer:

The energy is measured in terms of production and it is stored in the biomass of the organism. Biomass is defined as a quantitative estimate of the total mass of living organisms. It is measured in grams or kilograms per square meter. Gross primary production is equivalent to the carbon fixed during photosynthesis. Therefore, it is the cumulative energy stored in the organic molecules. The more the amount of carbon that is fixed, more the biomass produced. Hence, gross primary production is the amount of carbon fixed during photosynthesis.

Option d. is given as “gross primary production”.

The photosynthetic organisms, for example, plants, algae or cyanobacteria represent the first or primary trophic level, and their production is known as gross primary production. Hence, the correct answer is option d.

Reasons for incorrect answer:

Option a. is given as, “net primary production”.

Net primary production is defined as the gross primary production minus the energy used during cellular respiration of photosynthetic organisms. Hence, option a. is incorrect.

Option b. is given as, “biomagnification”.

The tendency of certain chemicals to concentrate on higher trophic levels in the food chain is known as biomagnification. Hence, option b. is incorrect.

Option c. is given as, “trophic-level transfer efficiency”.

Trophic-level transfer efficiency is defined as the amount of energy present at one trophic level that is acquired by the trophic level above and incorporated into the biomass. Hence, option c. is incorrect.

Option e. is given as, “production efficiency”.

Production efficiency is defined as the percentage of energy assimilated by an organism that becomes incorporated into new biomass. Hence, option e. is incorrect.

Hence, the options a., b., c., and e. are incorrect.

Conclusion

Hence, the amount of energy that is fixed during photosynthesis is known as gross primary production.

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