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B
Consumers
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C
Top consumers
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D
Decomposers
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Solution
The correct option is A Producers Number of primary producers per unit area are maximum in pond and grass ecosystem. The pyramid of number in grass/pond ecosystem is upright. In these ecosystems, primary producers are present in the first trophic levels. They consists of the phototrophs which synthesize their own food. The second trophic level consists of herbivores which as less number as compared to producers. The third trophic level consists of carnivores which has least number of organisms.