Question

Consider the following four statements (A - D) related to the common frog Rana tigrina and select the correct option stating which ones are true (T) and which ones are false (F).
Statements:
(A) On dry land, it would die due to lack of $O_2$ if its mouth is forcibly kept closed for a few days.
(B) It has the four-chambered heart.
(C) On dry land, it turns uricotelic from ureotelic.
(D) Its life history is carried out in pond water.
Options:
(A) (B) (C) (D)
(a) F F T T
(b) F T T F
(c) T F F T
(d) T T F F

• A. (a)
• B. (b)
• C. (c)
• D. (d)

Answer 1

Answer: (C)

(c)

The frogs take in oxygen and release carbon dioxide. They get oxygen by breathing through lungs, the lining of their mouths and their skin. When a frog is out of the water, its skin takes oxygen from the air. On dry land, they will die if their mouth is forcibly closed for some time.

Frogs have a three-chambered heart. It consists of two atria and one ventricle. Tadpoles eliminate nitrogenous wastes as ammonia (ammonotelic), but adult frog mainly eliminates urea (ureotelic). They are not uricotelic.

Frogs habitat is in or near pond.

So, the correct answer is option C.