NEET Zoology Endocrine Glands Assertion Reason Question
Assertion (A): The parathyroid hormone increases blood calcium levels.
Reason (R): The thyroid gland secretes thyrocalcitonin which decreases blood calcium levels.
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not the correct explanation of A.
A is true but R is false.
A is false.
Correct Answer
Detailed Explanation
The NCERT context states that thyrocalcitonin from the thyroid gland decreases blood calcium levels, while the parathyroid hormone increases blood calcium levels, making R the correct explanation for A.
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