Consider statements about human nutrition: 1. Calcium is essential for blood clotting. 2. Iron is a component of hemoglobin. 3. Iodine is required for thyroid hormone synthesis. Which are correct? MCQ with Answer and Explanation

Question

Consider statements about human nutrition: 1. Calcium is essential for blood clotting. 2. Iron is a component of hemoglobin. 3. Iodine is required for thyroid hormone synthesis. Which are correct?

A. 1 and 2 only

B. 2 and 3 only

C. 1 and 3 only

D. 1, 2 and 3

Answer: Option D

Solution (By JKSSB Mock Tests)

Calcium ions (Ca2+) are essential cofactors in the blood coagulation cascade, required for converting prothrombin to thrombin. Iron is the central atom in the heme group of hemoglobin, enabling oxygen transport in red blood cells. Iodine is an indispensable component of the thyroid hormones thyroxine (T4) and triiodothyronine (T3). All three statements are biologically accurate.

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Question #1

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The scientist who developed the first vaccine against yellow fever was:

A. Jonas Salk

B. Louis Pasteur

C. Edward Jenner

D. Max Theiler

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Correct Answer: Option D

Explanation:
Max Theiler developed the attenuated yellow fever vaccine (17D strain) in the 1930s, winning the Nobel Prize. Pasteur rabies, Jenner smallpox, Salk polio.

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Question #2

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Consider statements about human physiology: 1. The respiratory system exchanges gases. 2. The circulatory system transports blood. 3. The excretory system removes waste. Which are correct?

A. 1 and 3 only

B. 1 and 2 only

C. 2 and 3 only

D. 1, 2 and 3

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Correct Answer: Option D

Explanation:
The respiratory system, primarily the lungs, facilitates the exchange of gases (oxygen and carbon dioxide) between the blood and the external environment. The circulatory system, centered around the heart and blood vessels, transports blood containing oxygen, nutrients, hormones, and waste products throughout the body. The excretory system, primarily the kidneys, filters blood to remove metabolic waste products and excess water, excreting them as urine. All statements are correct.

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Question #3

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Which of the following statements about plant tissues is correct?

A. Phloem transports water and minerals.

B. Xylem transports organic nutrients.

C. Sclerenchyma cells have thick lignified walls and are often dead.

D. Collenchyma provides mechanical support and is dead at maturity.

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Correct Answer: Option C

Explanation:
Sclerenchyma provides strength, with thick lignified walls; cells are usually dead at maturity. Xylem transports water, phloem transports food, collenchyma is living with uneven thickening.

This question belongs to: Science Biology

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