Assertion :Bacteria and Protista do not have circulatory system. Reason: These organisms live in moist and watery environment.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
The concept of circulatory system exists in multicellular eukaryotes. Bacteria and protists are unicellular and can easily exchange gases, nutrients and excrete metabolic wastes either by active or passive transport through their membrane systems. Bacteria have transporters, porins and osmoprotectants and protists usually have contractile vacuoles for facilitating these processes.
So, the correct answer is option B.

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(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
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Reason (R) Order is determined experimentally and molecularity is the sum of the stoichimetric coeffcient of rate determining elementary step.

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