Which one of the following categories of animals, is correctly described with no single exception in it?
Held on 30 Apr 2012 · Verified 9 Jul 2026.
All reptiles possess scales, have a threechambered heart and are cold-blooded (poikilothermal)
All bony fishes have four pairs of gills and an operculum on each side
All sponges are marine and have collared cells
All mammals are viviparous and possess diaphragm for breathing
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : All vertebrates are chordates but all chordates are not vertebrate. Reason (R) : The members of subphylum vertebrata possess notochord during the embryonic period, the notochord is replaced by cartilaginous or bony vertebral column in adults. In the light of the above statements, choose the correct answer from the options given below:
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Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Members of subphylum vertebrata possess notochord during the embryonic period. The notochord is replaced by a cartilaginous or bony vertebral column in the adult. Reason R: Thus all chordates are vertebrates not all vertebrates are chordates. In the light of the above statements choose the correct answer from the option given below.
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