Assertion :Euglenoids change their shape. Reason: They have no rigid cell wall.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

Euglenoids are unicellular flagellate protists. They are without cellulose cell wall. The body is covered by thin and flexible pellicle. Euglenoids change their shape because they have no rigid cell wall. The pellicle is composed of fibrous elastic protein, the small amount of lipid and carbohydrates and maintains a definite shape. It is flexible enough to permit temporary changes in the body shape.

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