Zoology MCQs for NEET — Practice Questions with Answers

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Write full form of ACTH?

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Explanation

ACTH stands for Adreno cortico Tropic hormone. ACTH is a hormone produced in the anterior pituitary gland that stimulates the adrenal cortex.

Which of the following option is correct for the location of pineal gland?

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Explanation

The pineal gland is located under the corpus callosum and between the cerebral hemispheres. It is a small endocrine gland in the brain that produces melatonin, which regulates sleep patterns.

Which hormone regulate 24-hr rhythm of our body?

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Explanation

Melatonin is the hormone that regulates the 24-hour rhythm of our body, also known as the circadian rhythm. It is produced by the pineal gland in response to darkness and helps to manage sleep-wake cycles.

It is correct for the functionof pineal gland?

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It stimulates reabsorption of water from distal tubule of kidney

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Explanation

Antidiuretic hormone (ADH), also known as vasopressin, is responsible for stimulating the reabsorption of water from the distal tubule and collecting duct in the kidneys. This helps in maintaining the body's water balance and blood pressure.

Which cells are present on the wall of thryoid follicle?

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Explanation

The wall of the thyroid follicle is lined with cuboidal epithelial cells. These cells are involved in the synthesis and secretion of thyroid hormones. When the follicle is inactive, the cells appear more cuboidal, whereas they become columnar when the gland is active.

Which of the following causes formation of osteoblast?

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Explanation

Thyrocalcitonin (also known as calcitonin) helps in the formation of osteoblasts. Osteoblasts are cells that synthesize bone and are crucial for bone growth and healing. Thyrocalcitonin lowers blood calcium levels by promoting the uptake of calcium into the bones.

What is cause of exophthalmic goiter?

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Explanation

Exophthalmic goiter, also known as Graves' disease, is caused by the over secretion of thyroid hormones (hyperthyroidism). This leads to symptoms such as protruding eyes (exophthalmos), increased metabolism, and enlarged thyroid gland (goiter).

a and b hormones together maintain Ca+2 level of body?

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Explanation

Parathyroid hormone (PTH) and Thyrocalcitonin (TCT) together help regulate the calcium levels in the body. PTH increases blood calcium levels by promoting calcium release from bones, calcium absorption in the intestines, and calcium reabsorption in the kidneys. In contrast, TCT (calcitonin) lowers blood calcium levels by inhibiting bone resorption and promoting calcium deposition in bones.

Which of the following disorder occurs due to deficiency of ADH?

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Explanation

Diabetes insipidus is a disorder caused by the deficiency of Antidiuretic Hormone (ADH). ADH helps the kidneys manage the amount of water in the body. When ADH levels are low, it leads to excessive urination and thirst, key symptoms of diabetes insipidus.

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