Question

It was observed that tadpoles are not growing into adults frogs in a village. A scientist concluded that pond water doesnot contain sufficient
of mineral P which couldmake a harmone. Q . The harmone Q causes a phenomenon R in tadpoles so that they become adultfogs
What is P,Q,R?

Answer 1

p-iodine
q-thyroxine
r-metamorphosis

if you want in more detail then feel free to ask

Answer 2

P is selenium or iodine

Q is thyroxine harmone

R is the phenomenon of nutrition consumption