Q. Which of the following is/are correct for Porifera?

1. These are non-motile animals attached to some solid support.
2. There are holes or pores, all over the body.
3. These animals are covered with a soft outside layer.

Select the correct answer from the codes given below:
Answer: Only 1 and 2
Notes: The word Porifera means organisms with holes. These are non-motile animals attached to some solid support. There are holes or 'pores', all over the body. These lead to a canal system that helps in circulating water throughout the body to bring in food and oxygen. These animals are covered with a hard outside layer or skeleton. The body design involves very minimal differentiation and division into tissues. They are commonly called sponges, and are mainly found in marine habitats.