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Why is reabsorption of useful substances necessary after filtration in nephrons?

Answer and explanation

Correct answer: So that useful substances like glucose, salts, and water remain in the body

The governing concept is selective reabsorption during urine formation. Filtration at the glomerulus is not perfectly selective, so small useful substances such as glucose, required salts, and much of the water may enter the filtrate along with wastes. The nephron returns needed materials to the blood while retaining excess water and wastes for excretion. Therefore option A is correct. The other options misunderstand the roles of blood, lungs, and bile.

Related tags

NephronReabsorptionKidneyExcretionLife ProcessesWorld Of LivingScienceClass 10 Mcq

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