Which among the following statement(s) is/are correct for unicellular organisms?
A
Vital functions like respiration, nutrition, etc., are carried out by a single cell in chrysanthemum.
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B
Paramoecium consists of clusters of cells.
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C
Vital functions like digestion, nutrition, etc., in amoeba are carried out by a single cell.
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D
Paramoecium consists of a single cell.
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Solution
The correct option is D Paramoecium consists of a single cell.
Unicellular organism like amoeba, paramoecium, etc., consists of a single cell. So, all the vital functions like nutrition, digestion, excretion, reproduction, etc., are carried out by that single cell.
Multicellular organisms consists of many cells. Different cells carry out various specialised functions in these organisms. E.g., chrysanthemum (a plant), humans, etc.