Consider statements about vitamins: 1. Vitamin A is fat-soluble. 2. Vitamin C is water-soluble. 3. Vitamin D deficiency causes scurvy. Which are correct? MCQ with Answer and Explanation

Question

Consider statements about vitamins: 1. Vitamin A is fat-soluble. 2. Vitamin C is water-soluble. 3. Vitamin D deficiency causes scurvy. Which are correct?

A. 1 and 3 only

B. 2 and 3 only

C. 1 and 2 only

D. 1, 2 and 3

Answer: Option C

Solution (By JKSSB Mock Tests)

Vitamins A, D, E, and K are fat-soluble vitamins, meaning they are absorbed along with fats in the diet and can be stored in the body's fatty tissue and liver. Vitamin C and the B-complex vitamins are water-soluble, meaning they dissolve in water and are not stored in significant amounts. Vitamin D deficiency causes rickets in children and osteomalacia in adults; scurvy is caused by Vitamin C deficiency. Thus, statements 1 and 2 are correct.

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The pigment that gives urine its yellow color is:

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B. Urobilin

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D. Melanin

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Correct Answer: Option B

Explanation:
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Which of the following organisms is commonly used as a model organism in genetics?

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Correct Answer: Option A

Explanation:
Drosophila melanogaster (fruit fly) is a widely used model organism in genetics due to its short life cycle, large polytene chromosomes, easy culture, and high fecundity. Thomas Hunt Morgan established its use, discovering linkage and chromosomal theory. Musca domestica is housefly, Periplaneta cockroach, Bombyx silkworm. Many Nobel-winning genetic discoveries were made using Drosophila.

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The main excretory product in humans is:

A. Uric acid

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Correct Answer: Option D

Explanation:
Humans are ureotelic—they excrete nitrogenous waste mainly as urea, which is less toxic than ammonia and requires moderate water for excretion. Ammonia is excreted by aquatic animals, uric acid by birds and reptiles (to conserve water), and creatinine is also excreted but is a minor component compared to urea.

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