NEET 2010
- Exam
- NEET
- Year
- 2010
- Subject
- Botany
- Chapter
- Animal Kingdom
NEET 2010 · Botany · Animal Kingdom
Which one of the following statements about all the four of...
Which one of the following statements about all the four of Spongilla, leech, dolphin and penguin is correct?
Options
- APenguin is homoiothermic while the remaining three are poikilothermic
- BLeech is a fresh water form while all others are marine
- CSpongilla has special collared cells called choanocytes, not found in the remaining three
- DAll are bilaterally symmetrical
Correct answer
C. Spongilla has special collared cells called choanocytes, not found in the remaining three
Step-by-step solution
Spongilla belongs to phylum-Porifera, in which, choanoytes are the characteristic cells, these are absent in leech, dolphin and pengiun. These distinctive cells line the interior body walls of sponges. These cells have a central flagellum that is surrounded by a collar of micovilli. Choanocytes are versatile cells. Their flagella beat to create the active pumping of water through the sponge, while the collars of the choanocytes are the primary areas where nutrients are absorbed into the sponge.