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 O₂ its
mouth is forcibly kept closed for a few days
(B) It has four- chambered heart
(C) On dry land, it turns uricotelic from ureotelic
(D) Its life-history is carried out in pond water
Codes :
(A) (B) (C) (D)
(a) T F F T
(b) T T F F
(c) F F T T
(d) F T T F

Answer 1

Answer:

Explanation:

B is the answer

Answer 2

The correct option would be option a.)

Explanation:

• The common frog (Rana tigrina) exhibits following features:
• The frog will not survive on dry land because although they have lungs for carrying out the process of respiration, they also absorbs oxygen from their skin.
• Their skin contains pours which absorbs the oxygen and sends it to the blood, this is called as cutaneous respiration.
• But for this their skin needs to be moist, if it is taken to a dry land for very long period of time it will die. So, statement A ie true.
• The frogs have three chambered heart. They have right and left auricle but only one ventricle.
• So, statement B is false.
• The frogs have its larvae called tadpoles which are aquatic so their nitrogenous waste product is ammonia, but the adult frog is terrestrial and its nitrogenous waste product is urea. So, statement C is false.
• The frogs undergoes a process called metamorphosis in which the aquatic larvae metamorphoses to form adult frogs. But in its early developmental stages water is needed, and generally it is pond water. So, statement D is true.
• Therefore, the correct option is option a.)