Multiple choice

Which of the following is characteristic feature of 'Porifera'?

  1. Marine habitat

  2. Calcareous spicules

  3. Division of labour

  4. Canal system
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The canal system is a defining feature of Porifera (sponges), used for water circulation, feeding, and gas exchange. While many sponges are marine, some inhabit freshwater. Spicules can be calcareous or siliceous depending on the species. Division of labour is limited in sponges compared to more complex animals.

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