Question

Total amount of energy trapped by the green plant is called as
A. Gross primary production
B. Net primary production
C. Standing crop
D. Standing state

Answer 1

Production is the term given to the parts of fixed energy that pass from one trophic level to the other. The secondary productivity is the amount of formation of new organic matter from the consumer while the primary productivity depends upon the plant species residing in a particular area.

Complete answer:
- Gross primary productivity: It is the rate of the production of organic matter during photosynthesis showing total solar energy trapped in food during photosynthesis. In this process, the total solar energy is converted into chemical energy.
- Net primary production: It is the amount of energy-rich organic matter created per unit area and time after a part is used in respiration and the maintenance of the plant body. It is the remaining part of the gross primary production.
- Standing crop: It is the total number of organisms that thrives in a specific region of a place on the Earth and forms the biomass of the place. The number of living materials in the different trophic levels is usually expressed in the term of biomass.
- Standing state: It is the number of inorganic substances that are present in the ecosystems. It is the flow of inorganic nutrients between the living to the non-living and it generally describes non-living matter. It is usually exhausted by living matters.
So, the correct option is gross primary productivity.

Note: An ecosystem requires the constant supply of solar energy to function and sustain. The gross primary productivity can be calculated in terms of either chlorophyll contain such as Chl/g dry weight/unit area or the amount of carbon dioxide fixed/gchl/hr and it is also known as a photosynthetic number.