AIIMS 2018 Biology Phylum Mammalia MCQ Question with Solution

The correct sequence of steps in a Polymerase Chain Reaction (PCR) cycle is:

A

$Denaturation \rightarrow Annealing \rightarrow Extension$

B

$Annealing \rightarrow Denaturation \rightarrow Extension$

C

$Denaturation \rightarrow Extension \rightarrow annealing$

D

$Extension \rightarrow Annealing \rightarrow Denaturation$

Correct Answer

Option A

Detailed Explanation

Option A is correct because all the organisms listed—Balaenoptera (whales), Delphinus (dolphins), Rattus (rats), and Felis (cats)—belong to the phylum Chordata, characterized by the presence of a notochord, dorsal nerve cord, and pharyngeal slits at some stage of development. In contrast, option B is incorrect as it includes Euspongia, Scypha, and Pennatula, which belong to different phyla; Euspongia and Scypha are in the phylum Porifera (sponges), while Pennatula is in the phylum Cnidaria (soft corals). Understanding these classifications helps in recognizing the evolutionary relationships among various organisms.

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AIIMS 2018 Biology Phylum Mammalia MCQ Question

Correct Answer

Detailed Explanation

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