Class Notes NCERT Solutions for CBSE Students
Question: Briefly explain the Movement in cockroach?
Answer:Though cockroaches have two pairs of wings, they can fly short distances. However, they are able to run and climb very fast. Like all insects, cockroaches have three pairs of legs. They walk in a very interesting manner, moving three begs at a time. Let us suppose the clots represent legs.
Question: Briefly explain the Movement in Fish?
Answer: Most fish have a streamlined body – the head and the tail are narrow the middle portion of the body is broader. Fish have fins and a flexible backbone that helps them to swim. Most of the fishes have special structure called swim bladder that can be filled with air or emptied to help them move up and down in water.
Question: Briefly explain the Movement in Birds?
Answer: Most Birds are capable of flying. Birds can also walk run or hop on the ground. The wings are moved down and forwards lifting the body in the air. This movement is called down stroke. The wings are lifted upwards in preparation for another down-stroke. This movement is termed upstroke.
Question: Differentiate between vertebrates and invertebrate Give two example of each.
Answer: Vertebrates:
- Animals which have a backbone.
- Eg-Fish, Frog
Invertebrates:
- Animal which dont have a backbone.
- Eg- Earthworm, Snail
Question: How does a shell protect the snail?
Answer: The shell helps the snail by protecting from animals, heat or harsh climate.
