(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
 Assertion: phylum porifera are commonly known as sponges they are
generally and mostly asymmetrical animals.
Reason: sponges have a water transport or canal system water enter
through minute pore Ostia in the body wall into a central cavity from
where it goes out through the osculum

Dear student,
Please find below the answer:

The correct option is (a).

Members belonging to the phylum Porifera are commonly known as sponges. They are generally marine and mostly asymmetrical animals. Their bodies are porous. Their bodies have holes or pore (Ostia) all over, which allows the circulation of water throughout the body and bring in food and oxygen.

Hope this clears your doubt.

  • 0
What are you looking for?