Why are filtration and reabsorption both necessary in a nephron?
Answer and explanation
Correct answer: To remove wastes and conserve useful substances
A nephron first filters blood under pressure, producing a filtrate that contains wastes but may also contain useful substances such as glucose, salts, and water. Selective reabsorption returns the required amount of these substances to the blood, while unwanted materials remain in the tubule and form urine. Therefore filtration removes materials from blood and reabsorption prevents excessive loss of useful substances, making option A correct. The other options describe unrelated processes.
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What is the correct answer to this question?
To remove wastes and conserve useful substances
Why is this the correct answer?
A nephron first filters blood under pressure, producing a filtrate that contains wastes but may also contain useful substances such as glucose, salts, and water. Selective reabsorption returns the required amount of these substances to the blood, while unwanted materials remain in the tubule and form urine. Therefore filtration removes materials from blood and reabsorption prevents excessive loss of useful substances, making option A correct. The other options describe unrelated processes.
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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