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 focibly kept closed for a few days
(B) It has four-chambered heart
(C) On dry land it turns uricotelic from urcotelic
(D) Its life-history is carried out in pond water

• A. A-T; B-F; C-F; D-T
• B. A-T; B-T; C-F; D-
• C. A-F; B-F; C-T; D-T
• D. A-F; B-T; C-T; D-F

Answer 1

The correct option is A A-T; B-F; C-F; D-T

A. A-T; B-F; C-F; D-T

Explanation : In lungs, frog take in air through nostrils and mouth. Through pores they take up additional oxygen their skin directly into the bloodstream. This process called as cutaneous gas exchange. So, on the dry land it would die due to lack of oxygen. Frog have three chambered heart - the left atrium , right atrium and the ventricle. On dry land frogs are ureotelic in nature. The main nitrogenous waste is urea. The frog habitat is in pond water for successful breeding.

So, the correct option is A.