Identify the correct statement about the blood vessels: MCQ with Answer and Explanation

Question

Share Report Error

Identify the correct statement about the blood vessels:

A. Venules are smaller than capillaries.

B. Veins have thinner walls and larger lumen than arteries.

C. Capillaries have thick muscular walls.

D. Arteries have valves.

Answer: Option B

Solution (By JKSSB Mock Tests)

Veins have thinner walls and larger lumens; arteries are thick and elastic; capillaries are thin for exchange; venules are larger than capillaries. Valves are in veins.

This question belongs to: Science Biology

Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Biology Questions

Question #1

Assertion (A): The human heart is myogenic.
Reason (R): It beats rhythmically due to signals from the brain.

A. Both A and R are true, and R is the correct explanation.

B. A is true, but R is false.

C. A is false, but R is true.

D. Both A and R are true, but R is not the correct explanation.

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
The heart is myogenic because the heartbeat originates in the SA node within the heart itself, not from brain signals. The brain can modulate the rate but not initiate. Thus, A is true, but R is false.

This question belongs to: Science Biology

Question #2

The pigment that protects skin from UV radiation is:

A. Keratin

B. Elastin

C. Melanin

D. Collagen

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Melanin, produced by melanocytes, absorbs and dissipates UV radiation, protecting skin cells from DNA damage. Keratin is structural protein, collagen provides strength, elastin elasticity. Increased melanin production causes tanning.

This question belongs to: Science Biology

Question #3

The enzyme that breaks down hydrogen peroxide into water and oxygen in cells is:

A. Peroxidase

B. Lipase

C. Catalase

D. Amylase

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Catalase is found in peroxisomes and protects cells from oxidative damage by converting H₂O₂ (a toxic byproduct) into water and oxygen. Peroxidase also acts on peroxides but catalase is highly efficient. Amylase acts on starch, lipase on lipids. Liver and RBCs have high catalase activity.

This question belongs to: Science Biology

Explore All Biology MCQs