What is the location and function of collar cells?

  • A
    Location: Outer surface; Function: Protection
  • B
    Location: Body wall of Porifera; Function: Water circulation and food capture
  • C
    Location: Nervous system; Function: Impulse transmission
  • D
    Location: Reproductive organs; Function: Gamete production

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Sponges are

State the location and function of the following:
$(i)$ Contractile vacuole
$(ii)$ Ostia

What do sponges exhibit?

The layer of cells surrounding which structure is a characteristic feature of poriferans?

Choanocytes in an ascon type of canal system are found lining the:

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