The pigment that gives the characteristic yellow color to egg yolk is: MCQ with Answer and Explanation

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The pigment that gives the characteristic yellow color to egg yolk is:

A. Beta-carotene

B. Xanthophyll

C. Anthocyanin

D. Lycopene

Answer: Option B

Solution (By JKSSB Mock Tests)

Xanthophylls, oxygenated carotenoids, are responsible for the yellow color of egg yolk, autumn leaves, and corn. Beta-carotene is orange, lycopene red.

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Question #1

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The 'Hormone Thyroid Stimulating Hormone' (TSH) is secreted by the anterior pituitary. Its primary target organ and function are:

A. The kidneys; stimulating water reabsorption

B. The thyroid gland; stimulating the production and release of thyroid hormones (T3 and T4)

C. The ovaries; stimulating ovulation

D. The adrenal cortex; stimulating cortisol release

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Correct Answer: Option B

Explanation:
Thyroid Stimulating Hormone (TSH), also known as thyrotropin, is a glycoprotein hormone secreted by the thyrotroph cells of the anterior pituitary gland. Its primary and specific target is the thyroid gland. TSH binds to receptors on the thyroid follicular cells, stimulating all aspects of their function: the uptake of iodine, the synthesis of the thyroid hormones thyroxine (T4) and triiodothyronine (T3), and the release of these hormones into the bloodstream. TSH secretion is regulated by Thyrotropin-Releasing Hormone (TRH) from the hypothalamus and by negative feedback from T3 and T4.

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Question #2

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Consider the following statements about the human excretory system:
1. ADH increases water reabsorption.
2. Aldosterone increases sodium reabsorption.
3. Renin converts angiotensinogen to angiotensin I.
Which of the above is/are correct?

A. 1, 2, and 3

B. 2 and 3 only

C. 1 and 3 only

D. 1 and 2 only

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Correct Answer: Option A

Explanation:
All are correct: ADH (water), aldosterone (Na⁺), renin (angiotensinogen cleavage).

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Question #3

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The vitamin that functions as an antioxidant and is also known as tocopherol is:

A. Vitamin E

B. Vitamin A

C. Vitamin C

D. Vitamin D

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Correct Answer: Option A

Explanation:
Vitamin E (tocopherol) is a fat-soluble antioxidant that protects cell membranes from lipid peroxidation. Vitamin C is water-soluble antioxidant, A is for vision, D for calcium.

This question belongs to: Science Biology

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