The bone that protects the brain is the: MCQ with Answer and Explanation

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The bone that protects the brain is the:

A. Pelvis

B. Sternum

C. Cranium

D. Vertebra

Answer: Option C

Solution (By JKExamLibrary)

The cranium (skull) is composed of several bones fused together, encasing and protecting the brain. Vertebrae protect the spinal cord, sternum protects the heart and lungs anteriorly, pelvis supports abdominal organs and connects to legs. The cranium also provides attachment for muscles.

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Question #1

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Consider statements about human blood: 1. Red blood cells lack a nucleus at maturity. 2. Platelets are essential for blood clotting. 3. Plasma constitutes about 45% of blood volume. Which are correct?

A. 1 and 3 only

B. 2 and 3 only

C. 1 and 2 only

D. 1, 2 and 3

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Correct Answer: Option C

Explanation:
Mature mammalian red blood cells (erythrocytes) are enucleated to maximize space for hemoglobin. Platelets (thrombocytes) are cell fragments crucial for the blood coagulation cascade. Blood plasma, the liquid component, constitutes about 55% of total blood volume, while the formed elements (RBCs, WBCs, platelets) make up the remaining 45%. Thus, statements 1 and 2 are correct.

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Question #2

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Which of the following statements about the human eye is correct?

A. The blind spot contains a high density of cones.

B. The pupil is an opening that cannot change size.

C. The fovea has the highest concentration of rods.

D. The lens changes shape to focus on near or distant objects.

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Correct Answer: Option D

Explanation:
Accommodation involves lens shape change via ciliary muscles. The blind spot lacks photoreceptors; fovea has high cone density; pupil adjusts via iris.

This question belongs to: Science Biology

Question #3

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The voice box or sound-producing organ in humans is the:

A. Pharynx

B. Larynx

C. Bronchi

D. Trachea

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Correct Answer: Option B

Explanation:
The larynx, also called the voice box, contains vocal cords that vibrate as air passes, producing sound. It is located at the top of the trachea. The trachea (windpipe) conducts air; pharynx is the common passage for food and air; bronchi lead to lungs. The larynx is cartilaginous, and in males, the thyroid cartilage forms the Adam's apple.

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