Question

Sponges are

• A. Planktonic
• B. Nectonic
• C. Neuston
• D. Sedentary

Answer 1

The correct option is D Sedentary

A. Planktonic organisms are the ones that float on the surface of sea water.

B. Nectonic organisms are the ones that swim in the sea water.

C. Neuston organisms are the ones that move on the surface film of the water.

D. Sedentary organisms are the ones that are fixed at a place i.e. they are attached to a substratum.

Sponges are sessile organisms as they are attached to a substratum. Hence, they are sedentary organisms.

So, the correct answer is 'Sedentary'.