The level of organization in sponges is:

Digestion of food in the sponge $Leucosolenia$ occurs in:

Assertion $(A):$ The body of sponges is supported by a skeleton.
Reason $(R):$ The skeleton of sponges is made up of spicules and spongin fibres.

Which of the following is a characteristic of sponges?

The flagellated larva of $Leucosolenia$ is known as:

The cells in Porifera that are helpful in sexual reproduction are .........