Question

When a fish has to rise up in water, it diffuses oxygen gas from its blood into the bladder, so its volume …………… and its average density …………… .
(a) decreases, decreases
(b) increases, decreases
(c) decreases, increases
(d) increases, increases

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Answer

(b) increases, decreases

Reason — When a fish has to rise up in water, it diffuses oxygen gas from its blood into the bladder, so its volume increases and its average density decreases

This increases the volume of water displaced by the fish and so the upthrust on the fish increases due to which it

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