Question

Assertion(A): In hydra waste substances
are excreted through contractile vacuole
Reason (R) : Kidneys maintain the water
balance in the body​

Answer 1

a is false but r is true

kidney maintains the water balance in body by preventing dehydration and also they expell out urine from the body

but hydra doesn't excrete wastes through vacuole ,. it excrete it's waste substance through its mouth and body wall

so a is false but r is true