Q8 / 120 · NEET 2012 (Mains) · Botany

Which one of the following categories of animals, is correctly described with no single exception in it?

  • A
    All reptiles possess scales, have a threechambered heart and are cold-blooded (poikilothermal)
  • Correct answer
    B
    All bony fishes have four pairs of gills and an operculum on each side
  • C
    All sponges are marine and have collared cells
  • D
    All mammals are viviparous and possess diaphragm for breathing

Solution

Prototherian mammals are oviparous. Sponges are aquatic mostly marine some freshwater have cellular grade of organization. Choanocytes or collar cells are characteristics of porifers. Four pairs of gills occur in bony fishes. The gills are covered over by operculum on either side. All reptiles posses scales, are cold blood but have three-chambered and four-chambered heart.

Hence, the correct answer is option: 'B'.

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