Write the scientific names of:

(a) Prawn; (b) House fly; (c) Star fish; (d) Squid; (e) Appple snail; (f) Fresh water mussel.

Give four general characters of phylum Mollusca. Write down two examples.

Write down four general characters of phylum Echinodermata. Give two examples.

Name the phylum in which ambulacral system is present. What is its function?

What are adaptations in fishes due to which they are aquatic?