Question

1. Name the different types of muscles in the body wall of the earthworm.
2. Differentiate between endoskeleton and exoskeleton.
3. What are the different strokes of flapping birds?
4. Explain the movements in snakes.​

Answer 1

Answer:

1) Circular muscles and longitudinal muscles.

2)  i) Endoskeleton:

•  The internal skeleton or framework of the body of an animal is called as endoskeleton.

• Eg:  Mammals, reptiles, amphibians, insects, spiders and shellfish.

     ii)Exoskeleton:

• A hard outer layer that covers, supports, and protects the body of an invertebrate animal is called as exoskeleton.
• Eg:  grasshoppers, cockroaches, crabs and lobsters.

3) Down-stroke

    Up-stroke

4)  Serpentine locomotion

      Concertina locomotion

      Rectilinear locomotion

      sidewinding