Botany - Animal Kingdom Question with Solution | TestHub

$\left(\mathrm{A}\right)$All reptiles possess scales and are poikilothermal. They have a three chambered heart EXCEPT Crocodile, which has a four-chambered heart.

$\left(\mathrm{B}\right)$Bony fishes belong to the Class Osteicthyes of Phylum Chordata. All fishes belonging to this class have four pair of gills and an operculum on each side. There is no exception in them.

$\left(\mathrm{C}\right)$Sponges belong to the Phylum Porifera. They have collared cells known as chanocytes. Sponges are generally marine but some of them may even be found in fresh water. Eg: Spongilla is a fresh water sponge.

$\left(\mathrm{D}\right)$Mammals possess a diaphragm for breathing. They are generally viviparous EXCEPT Platypus (Orinthorhynchus) which is an oviparous mammal.

Thus, option$\left(\mathrm{B}\right)$is the correct option.