Question

All of the above
20. Hormone influencing metamorhosis in larvae of amphibians
(A) Thyroxine
(B) Ecdyosone
(C) ACTH
(D) All of the above
21. Teeth in frog are
(A) Homodont
(B) Acrodont
(C) Heterodont
(D) Homodont & Acrodont
22. Poisonous lizzard is
(A) Crotalus
(B) Heloderma​

Answer 1

Answer:

20. (D) All of the above

21. (D) Homodont & Acrodont

22. (B) Heloderma

Explanation:

20. (D) All of the above

21.As long as frogs are alive they lose their old teeth and replace them with new ones. This shows that frogs have polyphyodont teeth. This shows that the frogs teeth are acrodont, homodont and polyphyodont type.

22. It is believed that as many as 100 species of living lizards actually use venom. Until a few years ago, the only two known species of venomous lizards belonged to the family Helodermatidae and the genus Heloderma.