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- #National Eligibility Cum Entrance Test
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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 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
- Option 1)
A B C D
T F F T
- Option 2)
A B C D
T T F F
- Option 3)
A B C D
F F T T
- Option 4)
A B C D
F T T F
Answers (1)
heart function in cockroach -
Heart of cockroach is neurogenic (myogenic in frog, rabbit and man). The rate of heart beat is 49 per minutes. Blood circulation is completed in 5 to 6 minutes .
- wherein
Blood circulation is maintained by 13 pairs of wing shaped involuntary ciliary muscles
Frogs respire on land and in the water by two different methods. In water, skin acts as an aquatic respiratory organ (cutaneous respiration). Dissolved O2 in the water is exchanged through the skin by diffusion. On land, the buccal cavity, skin and lungs act as the respiratory organs. The respiration by lungs is called pulmonary respiration. In the water exchanged is through the skin by diffusion.In frog, heart has three -chambers, two atria and one ventricle, and is covered by a membrane called pericardium. The frog excreates urea and thus is a ureotelic animal. It never becomes uricotelic. In the frog, fertilisation is external and takes place in water.
Option 1)
A B C D
T F F T
This solution is correct
Option 2)
A B C D
T T F F
This solution is incorrect
Option 3)
A B C D
F F T T
This solution is incorrect
Option 4)
A B C D
F T T F
This solution is incorrect
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