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Question

Trophozoite of Entamoeba histolytica contains

A
Many pseudopodia and two contractile vacuoles.
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B
One pseudopodium and two contractile vacuole.
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C
Cell wall with fixed pseudopodia.
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D
Single pseudopodium and no contractile vacuole.
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Solution

The correct option is D Single pseudopodium and no contractile vacuole.
The adult trophic form of Entamoeba is known as 'Trophozoite' or 'Magna'. It inhabits anterior part of large intestine, i.e., colon of human beings.It leads a parasitic life and resembles amoeba. Its body is covered by plasmalemma and cytoplasm is differentiated into ectoplasm and endoplasm. There is a single large, broad and blunt pseudopodium formed of ectoplasm. Endoplasm contains single spherical nucleus and food vacuoles. Nucleus has a peripheral crown of chromatin blocks and a centrally located nucleolus. Entamoeba lacks contractile vacuole. Thus, the correct answer is option D.

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