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.
Which one of the following statements about all the four of Spongilla, leech, dolphin and penguin is correct?
NEET UG 2010 — Botany Animal Kingdom
2010mcqeasy
Which one of the following statements about all the four of Spongilla, leech, dolphin and penguin is correct?
Official previous-year question
Held on 30 Apr 2010 · Verified 9 Jul 2026.
Options
- A
Penguin is homoiothermic 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, not found in the remaining three
- D
All are bilaterally symmetrical
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