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Why are filtration and reabsorption both necessary in urine formation?

Answer and explanation

Correct answer: Filtration separates wastes and reabsorption saves useful substances

The governing concept is selective urine formation in a nephron. Glomerular filtration allows small molecules, water, salts, glucose, and urea to leave the blood, so wastes can be removed but useful substances may also enter the filtrate. During reabsorption, needed water, glucose, and suitable ions return to the blood according to the body’s requirements. Therefore option A is correct; the other choices confuse excretion with photosynthesis, circulation, or respiration.

Related tags

Urine-FormationFiltrationReabsorptionLife ProcessesWorld Of LivingScienceClass 10 Mcq

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