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Which one of the following statements about all the four of Spongilla, Leech, Dolphin and Penguin is correct?

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

Solution & Step-by-step Explanation

Choanocytes (collar cells) are the characteristic flagellated cells that line the spongocoel and canals of sponges (Phylum Porifera) like Spongilla. They are unique to sponges and are not found in Annelids (Leech), Mammals (Dolphin), or Birds (Penguin).

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Which one of the following statements about all the four of Spongilla, Leech, Dolphin and Penguin is correct?
A
All are bilaterally symmetrical.
B
Penguin is homoiothermic while the remaining three are poikilothermic.
C
Leech is a fresh water form while all others are marine.
D
Spongilla has special collared cells called choanocytes, not found in the remaining three.

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Animal KingdomPoriferaChoanocytes

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