1. A/An (earthworm/snail)
does not have a skeleton.
2. A cockroach has an
(exoskeleton/endoskeleton).
3. A snake has a flexible
(body/backbone) which helps it move.
4. A fish has a
(streamlined/oval) shape.
Answers
Answer:
Column II
Upper jaw has fins on the body
Fish has an outer skeleton
Ribs can fly in the air
Snail is a movable joint
Cockroach protect the heart
shows very slow movement
have a streamlined body
Answer:
Column I Column II
Upper jaw is an immovable joint
Fish have fins on the body, have a streamlined body
Ribs protect the heart
Snail shows very slow movement
Cockroach has an outer skeleton, can fly in the air
Question 4:
Answer the following:
(a) What is a ball and socket joint?
(b) Which of the skull bones are movable?
(c) Why can our elbow not move backwards?
Answer:
(a)A ball and socket joint is a moveable joint. It has a rounded end of one bone fit into the cavity (hollow space) of the other bone. It allows movement in all directions.
Example: shoulder joints.
(b)Only the lower jaw in skull bones is movable.
(c) Elbow joint is an example of hinge joint which allows only back and forth movements. Thus, we cannot move our elbow backwards.
Explanation:
Column II
Upper jaw has fins on the body
Fish has an outer skeleton
Ribs can fly in the air
Snail is a movable joint
Cockroach protect the heart
shows very slow movement
have a streamlined body
Answer:
Column I Column II
Upper jaw is an immovable joint
Fish have fins on the body, have a streamlined body
Ribs protect the heart
Snail shows very slow movement
Cockroach has an outer skeleton, can fly in the air
Question 4:
Answer the following:
(a) What is a ball and socket joint?
(b) Which of the skull bones are movable?
(c) Why can our elbow not move backwards?
Answer:
(a)A ball and socket joint is a moveable joint. It has a rounded end of one bone fit into the cavity (hollow space) of the other bone. It allows movement in all directions.
Example: shoulder joints.
(b)Only the lower jaw in skull bones is movable.
(c) Elbow joint is an example of hinge joint which allows only back and forth movements. Thus, we cannot move our elbow backwards.