MCQ
In an ecosystem, the population of:
- APrimary producers is larger than primary consumers.
- BSecondary consumers is largest.
- CPrimary consumers out numbers primary producers.
- DPrimary consumers are least dependent upon primary producers.
Explanation:
The bottom of the biomass pyramid represents the primary producers (autotrophs). The primary producers trap energy from the sunlight or inorganic chemicals and use it to create energy-rich molecules such as carbohydrates. This mechanism is called as primary production. When energy is transferred from one trophic level to the next, typically only ten percent is used to build new biomass. The remaining ninety percent goes to metabolic processes or is dissipated as heat. The primary consumers are arranged above the producers as because they are less in number.
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$I.$ The total organic matter synthesised by the producers in the process of photosynthesis per unit time and area is known as gross primary productivity
$II.$ Net primary productivity is the weight of the organic matter stored by the producers in a unit area/volume per unit time