Freshwater bony fishes maintain water balance | vedclass

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Question

(A) Freshwater bony fishes live in a medium that is hypotonic to their body fluids. Consequently,water tends to enter their bodies through osmosis,pri

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Excreting hypotonic urine

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(A) Freshwater bony fishes live in a medium that is hypotonic to their body fluids. Consequently,water tends to enter their bodies through osmosis,primarily across the gills. To maintain osmotic balance,these fishes: $1$. Excrete large volumes of very dilute (hypotonic) urine to remove excess water. $2$. Actively absorb salts from the surrounding water through their gills to compensate for salt loss. $3$. They do not drink water,as they already have an excess of it. Therefore,the correct mechanism for maintaining water balance is the excretion of hypotonic urine.

Animals	Excretory organs
$(A)$ Earthworm	$(i)$ Renette cell
$(B)$ Cockroach	$(ii)$ Nephridia
$(C)$ Taenia	$(iii)$ Malpighian tubules
$(D)$ Ascaris	$(iv)$ Flame cells

Freshwater bony fishes maintain water balance by:

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Animals Excretory organs

$(A)$ Earthworm $(i)$ Renette cell

$(B)$ Cockroach $(ii)$ Nephridia

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$(D)$ Ascaris $(iv)$ Flame cells

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