Question

Which one of the following statements about all the four of Spongilla, leech, dolphin and penguin is correct?

• A. Penguin is homoiothermic while the remaining three are poikilothermic
• B. Leech is a freshwater form while all others are marine
• C. Spongilla has special collared cells called choanocytes, not found in the remaining three
• D. All are bilaterally symmetrical

Answer 1

Answer: (C)

Spongilla has special collared cells called choanocytes, not found in the remaining three

Answer 2

Spongilla is a freshwater sponge in which the inner cellular layer of body consists of highly specialised flagellated cells called choanocytes. These cells are not found in leech, dolphin and penguin.