Assertion :
Process of maintaining a constant internal environment is known as homeostasis.

Reason: Kidneys are excretory and homeostatic organs.

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
Walter Cannon (1932) was introduced the term homeostasis (homoios $=$ same; stasis $=$ standing). Homeostasis maintains the stability of the cell environment and this way provides the organism with a degree of independence of the environment; in order to achieve stability. Mammals have two kidneys which perform excretory function and maintain urea level in blood.
So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.

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Assertion :Process of maintaining a constant internal environment is known as homeostasis. Reason: Kidneys are excretory and homeostatic organs.

Assertion :
Process of maintaining a constant internal environment is known as homeostasis.

Reason: Kidneys are excretory and homeostatic organs.