Which one of the following categories of animals is correctly described with no exception in it?
Correct answer: B. All bony fishes have four pairs of gills and an operculum on each side
- A. All reptiles possess scales, have a three chambered heart and are cold blooded
- 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
Explanation
All bony fishes do have four pairs of gills and an operculum on each side of their bodies. The operculum is a protective bony plate that covers and helps protect the delicate gill filaments. This arrangement allows bony fishes to extract oxygen from the water as it flows over their gills and to expel carbon dioxide. The heart is generally 3 chambered in reptiles but in the crocodile it is 4 chambered. Sponges are generally marine and have collared cells but few fresh water forms can also be seen like Spongilla. All mammals are viviparous (giving birth to young ones) with an oviparous (egg laying) exception: Ornithorhynchus (platypus).
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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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