Animal Kingdom Ques 9
9. Which one of the following categories of animals, is correctly described with no single exception in it?
(a) All sponges are marine and have collar cells.
(b) All mammals are viviparous or ovoviviparous and possess a diaphragm for breathing.
(c) All bony fishes have four pairs of gills and an operculum on each side.
(d) All reptiles possess scales, have a three chambered heart and are ectothermic (poikilothermal).
Show Answer
Answer : a
Hints & Solutions
(a) All sponges are marine and have collared cells without any exception. Sponges are animals of the phylum Porifera. They are multicellular organisms which have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells.
BETA
