ICSE Class 9 Biology
Question 3 of 12
Five Kingdom Classification — Question 11
Back to all questions 11
Question Identify the invertebrate phyla P and Q based on the characteristics given below :
| Characteristics | Invertebrate Phyla |
|---|---|
| Usually have a skeleton of microscopic spicules or elastic spongin fibres. | P |
| Soft, round, cylindrical body with a false body cavity. | Q |
- P — Porifera, Q — Cnidaria
- P — Cnidaria, Q — Platyhelminthes
- P — Porifera, Q — Nematoda
- P — Nematoda, Q — Cnidaria
P — Porifera, Q — Nematoda
Reason — Members of Porifera (sponges) have bodies supported by spicules which provide structure. Nematodes (roundworms) have a pseudocoelom (false body cavity), and their body is soft, cylindrical, and unsegmented.