Question

Organ system level of organisation is seen in

• A. sponges
• B. coelenterates
• C. cnidarians
• D. annelids

Answer 1

Answer: (C), (D)

The correct options are D

Explanation of the correct option:

1. Organ system level of organisation is observed in Phylum Aschelminthes (Nematoda), and all the groups above it in the Animal Kingdom.
2. Sponges exhibit cellular level or organisation, while cnidarians exhibit tissue level of organisation.

Explanation of the incorrect option:

Option A
Sponges have Cellular level of organisation

Option B

In Coelenterates, the body is radially symmetrical and exhibit a tissue-level organization.

Option C

Cnidarians have tissue level of organisation.

Final answer: Organ system level of organisation is seen in Annelids.