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.
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What is the correct answer to this question?
Filtration separates wastes and reabsorption saves useful substances
Why is this the correct answer?
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.
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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