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Chemical Coordination and Control MCQs for NEET — Zoology Questions with Answers

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Which of the following is true about Insulin

A. responsible for hypoglycemia B. Enhances the cellular glucose uptake C. Acts mainly on hepatocytes and adipocytes D. All of these

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Explanation

Refer NCERT, Heading 22.2.8, Last Para, page 337

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The glucose homeostasis in blood is maintained by

A. Insulin B. Glucagons C. Both 1 and 2 D. None of these

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Explanation

Refer NCERT, Heading 22.2.8 Para 1 page 337

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Which of the following is not true about testosterone

A. stimulates spermatogenesis B. influence libido C. Catabolic effects on protein metabolism D. responsible for aggressiveness in male

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Explanation

Refer NCERT, Heading 22.2.9 Para 2 page 338

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Which of the following is true about testosterone

A. regulate accessory sex organs development B. stimulate muscular growth C. responsible for low pitch voice D. All of the above

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Explanation

Refer NCERT, Heading 22.2.9 Para 1 page 338

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Which of the following is an ovarian hormone

A. estrogen B. Progesterone C. Inhibin D. All of these

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Explanation

Refer NCERT, Heading 22.2.10 Para 1 page 338

Inhibin: One of two hormones (designated inhibin-A and inhibin-B) secreted by the gonads (by Sertoli cells in the male and the granulosa cells in the female) and that inhibit the production of follicle-stimulating hormone (FSH) by the pituitary gland.

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Which of the following hormone is called pregnancy hormone

A. Estrogen B. Progesterone C. Oxytocin D. All of the above

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Explanation

Refer NCERT, Heading 22.2.10 Para 1 page 338

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Which of the following is true about progesterone

A. Supports pregnancy B. Stimulates the formation of alveoli in breast C. stimulates milk secretion D. All of these

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Explanation

Refer NCERT, Heading 22.2.10 Para 2 page 339

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Which of the following is true about estrogen

A. responsible for high pitch of voice B. regulate female sexual behaviour C. regulate growth of female secondary sex organs D. All of these

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Explanation

Refer NCERT, Heading 22.2.10 Para 1 page 338

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Hormones that typically interact with membrane-bound receptors utilize which of the following mechanisms for their action?

A. Directly enter the target cell and bind to nuclear receptors. B. Regulate gene expression by forming a hormone-receptor complex with the genome. C. Generate secondary messengers like cAMP or $Ca^{++}$ that regulate cellular metabolism. D. Are primarily steroid hormones or iodothyronines that act intracellularly.

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Explanation

According to NCERT, 'Hormones which interact with membrane-bound receptors normally do not enter the target cell, but generate second messengers (e.g., cyclic AMP, $IP_3$, $Ca^{++}$ etc) which in turn regulate cellular metabolism (Figure 19.5a).' Options 1, 2, and 4 describe mechanisms employed by hormones interacting with intracellular receptors.

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Which of the following hormone types primarily regulates gene expression or chromosome function by interacting with intracellular receptors?

A. Peptide, polypeptide, protein hormones B. Steroid hormones and iodothyronines C. Amino-acid derivatives like epinephrine D. Hormones that require second messengers (e.g., $IP_3$)

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Explanation

The NCERT states: 'Hormones which interact with intracellular receptors (e.g., steroid hormones, iodothyronines, etc.) mostly regulate gene expression or chromosome function by the interaction of hormone-receptor complex with the genome.' Peptide hormones, protein hormones, and amino-acid derivatives typically interact with membrane-bound receptors and use second messengers.

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