21. Which of the following is a characteristic feature of the phylum Porifera?
Answer: c) Pores on the body
22. Cnidarians are characterized by the presence of:
Answer: a) Cnidocytes
23. Ctenophores are also known as:
Answer: a) Comb jellies
24. Which of the following is an example of a platyhelminth?
Answer: b) Tapeworm
25. Nematodes are also referred to as:
Answer: a) Roundworms
26. The characteristic feature of Annelids is the presence of:
Answer: a) Segmented body
27. Which one of the following is a type study of the phylum Annelida in NCERT?
Answer: b) Earthworm
28. Arthropods are characterized by:
Answer: a) Jointed appendages
29. Molluscs typically possess:
Answer: a) Radula
30. Echinoderms exhibit which type of symmetry in adulthood?
Answer: b) Radial symmetry
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