Q11. Which vitamin is crucial for maintaining the health of epithelial tissues and skin?
a) Vitamin A
b) Vitamin B
c) Vitamin C
d) Vitamin D
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Correct Answer: a) Vitamin A
Explanation: Vitamin A is essential for the maintenance and repair of epithelial tissues, which include skin and the linings of the respiratory, urinary, and intestinal tracts.
Q12. Cod liver oil is an excellent source of which vitamin?
a) Vitamin A
b) Vitamin C
c) Vitamin D
d) Vitamin E
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Correct Answer: a) Vitamin A
Explanation: Cod liver oil is rich in Vitamin A, as well as Vitamin D. It has been traditionally used to prevent and treat deficiency in these vitamins.
Q13. What is the major benefit of consuming beta-carotene rich foods over supplements for Vitamin A?
a) No calorie intake
b) Better absorption
c) Reduced risk of toxicity
d) Increased fibre content
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Correct Answer: c) Reduced risk of toxicity
Explanation: Consuming beta-carotene rich foods over supplements reduces the risk of Vitamin A toxicity. The body converts beta-carotene to Vitamin A as needed, which limits excessive build-up.
Q14. Which of the following food is not a good source of Vitamin A?
a) Spinach
b) Beef liver
c) Oranges
d) Carrots
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Correct Answer: c) Oranges
Explanation: Oranges, while high in Vitamin C, are not a significant source of Vitamin A. Spinach, beef liver, and carrots are rich in Vitamin A.
Q15. Vitamin A plays a crucial role in:
a) Blood sugar regulation
b) Blood pressure control
c) Reproduction and cellular communication
d) Cholesterol regulation
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Correct Answer: c) Reproduction and cellular communication
Explanation: Vitamin A is essential for normal reproduction, growth and development, and cellular communication. It is involved in the formation and maintenance of the heart, lungs, kidneys, and other organs.
Q16. Which of the following population groups is most at risk of Vitamin A deficiency?
a) Adolescents
b) Pregnant women
c) Elderly individuals
d) Middle-aged men
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Correct Answer: b) Pregnant women
Explanation: Pregnant women are particularly at risk for Vitamin A deficiency, especially in developing countries. This deficiency can have serious implications for both the mother and the developing foetus.
Q17. Which type of Vitamin A is present in plant-based foods?
a) Retinol
b) Retinal
c) Beta-carotene
d) Retinoic acid
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Correct Answer: c) Beta-carotene
Explanation: Beta-carotene, a type of provitamin A, is found in plant-based foods. It is converted into retinol in the body and used as Vitamin A.
Q18. What is the main function of retinoic acid, a form of Vitamin A?
a) Bone growth
b) Blood clotting
c) Gene transcription
d) Protein synthesis
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Correct Answer: c) Gene transcription
Explanation: Retinoic acid, an active form of Vitamin A, plays a vital role in gene transcription. It helps regulate the expression of genes involved in cell differentiation and growth.
Q19. Which body organ is most affected by excess Vitamin A consumption?
a) Heart
b) Lungs
c) Liver
d) Kidneys
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Correct Answer: c) Liver
Explanation: The liver is most affected by excess Vitamin A consumption since it’s where Vitamin A is stored. Chronic intake of high doses can lead to liver damage and toxicity.
Q20. Sweet potatoes are a rich source of:
a) Vitamin B
b) Vitamin C
c) Vitamin A
d) Vitamin D
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Correct Answer: c) Vitamin A
Explanation: Sweet potatoes are an excellent source of beta-carotene, which the body can convert into Vitamin A. They contribute significantly to meeting dietary Vitamin A requirements.