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Which of the following best describes gross primary productivity in an ecosystem?A. Gross primary productivity is the total amount of energy captured by producers plus the energy used by consumers over time.B. Gross primary productivity is the total amount of energy captured by producers minus the energy that producers respire over time.C. Gross primary productivity is the total amount of energy lost as heat during energy transfer between trophic levels.D. Gross primary productivity is the total amount of solar energy captured by producers through photosynthesis over time.

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Answer:

D. Gross primary productivity is the total amount of solar energy captured by producers through photosynthesis over time.

Explanation:

The gross primary productivity of an ecosystem represents the rate at which the producers of the system capture the solar energy so that they can perform the process of photosynthesis. Therefore, GPP is the total amount of photosynthetic energy captured per unit area over a given time period. Producers consume the part of the GPP for their own respiration and maintenance. Therefore, gross primary productivity is the sum total of the growth of producers per unit area per unit time and the energy used by them for respiration.

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Gross primary productivity is the total amount of solar energy captured by producers through photosynthesis over time.

Primary productivity indicates the amount of energy with which producers can supply the rest of the organisms in the ecosystem.

  • Organisms that are capable of synthesizing organic materials from inorganic components are the primary producers or autotrophs.

  • Gross Primary Productivity is carried out by photosynthesis and is the total photosynthesis consumed during the measurement period.

  • The factors that directly influence the photosynthetic rate are: light, water, nutrients, there are other factors that influence the GPP as the arrangement and dimension of the photosynthetic surfaces.

Therefore, we can conclude that the gross primary production of an ecosystem is the total energy fixed through photosynthesis by producers.

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