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Which one of the following statements about all the four of Spongila, leech, dolphin and penguin is correct?
  • 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, not found in the remaining three.
  • d)
    All are bilaterally symmetrical.
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Which one of the following statements about all the four of Spongila, ...
Spongilla is a fresh water sponge in which the inner cellular layer of body consists of highly specialized flagellate cells called choanocytes. These cells are not found in leach dolphin and penguin.
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Community Answer
Which one of the following statements about all the four of Spongila, ...
The correct answer is option 'C': Spongilla has special collared cells called choanocytes, not found in the remaining three.

Explanation:
- Spongilla is a genus of freshwater sponge, while leech, dolphin, and penguin belong to different animal groups.
- The statement mentions that Spongilla has special collared cells called choanocytes, which are not found in the remaining three organisms.
- Choanocytes: Choanocytes are specialized cells found in sponges. They have a collar-like structure with a flagellum projecting from the center. These cells help in creating water currents and capturing food particles.
- Spongilla, being a freshwater sponge, relies on choanocytes for filter-feeding.
- In contrast, leeches are segmented worms, dolphins are marine mammals, and penguins are flightless birds. These organisms do not possess choanocytes.
- The other statements in the options are incorrect:
- Option 'A': Penguins are not homeothermic; they are actually endothermic, meaning they can generate and regulate their own body heat. The remaining three organisms (Spongilla, leech, and dolphin) are poikilothermic, meaning their body temperature is dependent on external factors.
- Option 'B': Leeches can be found in both freshwater and marine environments. Dolphins are marine mammals, penguins inhabit marine and terrestrial habitats, while Spongilla is a freshwater sponge.
- Option 'D': Although all the mentioned organisms are bilaterally symmetrical, this statement is not specific to only these four organisms and can be true for many other animals as well.

In summary, the correct statement is that Spongilla has special collared cells called choanocytes, which are not found in leech, dolphin, and penguin.
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Which one of the following statements about all the four of Spongila, leech, dolphin and penguin is correct?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, not found in the remaining three.d)All are bilaterally symmetrical.Correct answer is option 'C'. Can you explain this answer?
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