How do villi make absorption more effective in the small intestine?
Answer and explanation
Correct answer: They increase surface area
The governing concept is adaptation of structure for efficient absorption. Villi are numerous finger-like projections on the inner lining of the small intestine. Together they greatly increase the available surface area, allowing more digested nutrients to contact the absorptive lining at the same time. Their thin epithelium and nearby blood capillaries further support transfer into the blood. Therefore option A is correct; villi do not make acid, pump blood, or fill lungs with air.
Frequently asked questions
What is the correct answer to this question?
They increase surface area
Why is this the correct answer?
The governing concept is adaptation of structure for efficient absorption. Villi are numerous finger-like projections on the inner lining of the small intestine. Together they greatly increase the available surface area, allowing more digested nutrients to contact the absorptive lining at the same time. Their thin epithelium and nearby blood capillaries further support transfer into the blood. Therefore option A is correct; villi do not make acid, pump blood, or fill lungs with air.
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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