Why are valves present in veins?
Answer and explanation
Correct answer: To prevent backflow of blood
The governing concept is one-way blood flow. Veins carry blood toward the heart, but the pressure inside them is relatively low, especially in vessels returning blood from the lower parts of the body. Valves open when blood moves toward the heart and close if it tends to reverse direction. Therefore, option A is correct. The other options are unrelated because valves neither change blood colour, make food, nor produce oxygen.
Frequently asked questions
What is the correct answer to this question?
To prevent backflow of blood
Why is this the correct answer?
The governing concept is one-way blood flow. Veins carry blood toward the heart, but the pressure inside them is relatively low, especially in vessels returning blood from the lower parts of the body. Valves open when blood moves toward the heart and close if it tends to reverse direction. Therefore, option A is correct. The other options are unrelated because valves neither change blood colour, make food, nor produce oxygen.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Life Processes.
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