Trophozoite of Entamoeba histolytica contains

Many pseudopodia and two contractile vacuoles.

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One pseudopodium and two contractile vacuole.

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Cell wall with fixed pseudopodia.

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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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Similar questions

Question 24
The table given below has certain terms and four blank spaces named A, B, C, and D

From the options given below choose the correct combination of terms.

(a) A-Pseudopodia; B-Respirations; C-Muscle cell; D-Branched
(b) A-Pseudopodia; B-Photosynthesis; C-Muscle cell; D-Branched
(c) A-Contractile vacuole; B-Photosynthesis; C-Blood cell; D-Spindle shaped
(d) A-Pseudopodia; B-Photosynthesis; C-Cheek cell; D-Spindle shaped

Q. A single-celled organism which has contractile vacuole to move water from inside to outside of the cell was studied in an experiment in which the organism was placed in water with different salt concentrations. The rate at which the contractile vacuole contracted to pump out excess water was recorded.

Salt conc.	Rate of contractile vacuole contractions per minute
Very high	2
High	8
Medium	15
Low	22
Very Low	30

Which of the following explains the observed relationship between the rate of contractile vacuole contraction and the salt concentration?

Match the following

nucleus. Cell wall

plastid Vacuole

plant cell Nucleolus

cytoplasm Chlorophyll

eukaryotes. Pseudopodia

Nuclear membrane

Question 24
The table given below has certain terms and four blank spaces named A, B, C and D
$\begin{matrix} C e l l & F e a t u r e / p a r t & F u n c t i o n A m e o b a & A & M o v e m e n t P l a n t c e l l & P l a s t i d & B C & S p i n d l e s h a p e d & C o n t r a c t i o n N e r v e c e l l & D & S t i m u l i a n d r e s p o n s e \end{matrix}$
From the options given below choose the correct combination of terms.

(a) A-Pseudopodia; B-Respirations; C-Muscle cell; D-Branched
(b) A-Pseudopodia; B-Photosynthesis; C-Muscle cell; D-Branched
(c) A-Contractile vacuole; B-Photosynthesis; C-Blood cell; D-Spindle shaped
(d) A-Pseudopodia; B-Photosynthesis; C-Cheek cell; D-Spindle shaped

What is contractile vacuole?

And how is it different from normal vacuole

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