Earthworm

Q. Which of the following organisms do not have bones?

1. Dogs
2. Fish
3. Earthworm
4. Snake

Q. Which of the following statements is correct about an earthworm?

1. Its body has very small bones that help in movement.
2. Its body is made up of many rings joined end to end.
3. It cannot extend and shorten its body.
4. Earthworms cannot move through soil.

Q. In an earthworm, _____________ help to extend and shorten the body.

1. bones
2. muscles
3. foot
4. bristles

Q. Differentiate between vertebrates and invertebrates.

1. (i) Vertebrates: (a) Notochord is present, (b) True internal skeleton present.
   (ii) Invertebrates:(a) Notochord is absent, (b) No true internal skeleton present.
2. (i) Vertebrates: (a) Notochord is absent, (b) No true internal skeleton present.
   (ii) Invertebrates: (a) Notochord is present, (b) True internal skeleton present.
3. (i) Vertebrates: (a) Nervechord is present, (b) True internal skeleton present.
   (ii) Invertebrates:(a) Notochord is absent, (b) True internal skeleton present.
4. (i) Vertebrates: (a) Nervechord is present, (b) True internal skeleton present.
   (ii) Invertebrates:(a) Notochord is absent, (b) No true internal skeleton present.