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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.

Related tags

NephronFiltrationReabsorptionLife ProcessesWorld Of LivingScienceClass 10 Mcq

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