While comparing invertebrate groups, a sponge obtains nutrition by pumping water and trapping suspended particles. The feature being tested is:

Correct Answer: D

filter feeding

Sponges are filter feeders. Choanocyte flagella drive water flow, and food particles are captured from the water rather than chased or scraped from surfaces. This MCQ belongs to the Porifera topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.