A) Producers
B) Decomposers
C) Primary consumers
D) Secondary consumers
Correct Answer: A
Solution :
[a] phytoplanktons of a pond ecosystem acts as producers because they produce carbohydrates by photosynthesis. Members of the phytoplankton like algae, diatoms, dinoflagellates etc. are of great importance as they form the basis of food for all other forms of aquatic life because all of them are primary producers.
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