A student drew the following diagram upon observing a permanent slide of binary fission in amoeba. Identify the fault in the diagram.

Size of daughter cell to be formed is not appropriate.

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Constriction has appeared before nuclear division.

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Constriction is not equally deep on the either side.

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None of the above.

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Solution

The correct option is B Constriction has appeared before nuclear division.
Amoeba reproduce by the asexual method of binary fission. It is an unicellular irregular shaped protozoan. So plane of division can be any for binary fission. First there is elongation of the nucleus followed by its division. Then cytoplasmic constriction takes place and it is divided. Finally there is formation of two daughter cells. So constriction should appear before nuclear division. Thus the correct answer is option B.

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