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Q.

Which of the following organisms exhibits all the following features?

(a) Poikilothermy

(b) Three-chambered heart 

(c External fertilisation 

(d) Indirect development

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a

Bufo

b

Clarias

c

Pristis

d

Betta

answer is A.

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Detailed Solution

Bufo is an amphibian and has a three-chambered heart. It exhibits external fertilisation and indirect development.

Clarias, Pristis and Betta are fishes and have a two-chambered heart.

Both fishes and amphibians exhibit poikilothermy (cold-blooded).

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