Which one of the following statements about all the four of Spongilla, leech, dolphin and penguin is correct?
Correct answer: C. Spongilla has special collared cells called choanocytes which are not found in the remaining three
- A. Penguin is homeothermic while the remaining three are poikilothermic
- B. Leech is a fresh water form while all others are marine
- C. Spongilla has special collared cells called choanocytes which are not found in the remaining three
- D. All are bilaterally symmetrical
Explanation
Spongilla is a common, widely distributed fresh water sponge belonging to phylum porifera. Canal system in Spongilla is essentially of rhagon type with choanocytes restricted to small rounded chambers. It is not found in leeches, dolphins or penguins.
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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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