Write one difference between Arthropoda and Mollusca.

Write one difference between Invertebrates and Vertebrates.

Draw a neat diagram of a fish and label the five kinds of fins, operculum and mouth. Answer the following questions :

1. Name the phylum and the class to which fishes belong.
2. What is the one advantage of their specific body shape ?
3. Do they breathe through nostrils ? If not, mention the role of nostrils.
4. Mention the breathing and locomotory structures in fishes.
5. Give any two examples of fishes.

Given alongside are the figures of two organisms. Study the organisms and answer the following questions :

1. Name the organisms [A] and [B].
2. Label the guidelines 1 and 2.
3. Do they belong to the same phylum ? If yes, name the phylum.
4. What are the two important functions of part 1 ?
5. Mention the mode of reproduction shown in figure [B]. Is it a kind of asexual or sexual reproduction ?