The chapter “Body Movement” focuses on understanding how living organisms move, with special emphasis on the human body. It explains the skeletal system and the importance of bones, joints, and muscles in facilitating movement. Students will learn about different types of joints and how they function, along with observing movements in other organisms like earthworms, fish, and birds.
Important Terms and Definitions:
Body Movement Solutions
“Explore Class 6 Science Chapter ‘Body Movement’ with detailed questions and answers about human bones, joints, and how living organisms move. Ideal for BOSEM students.”
Textbook exercises
1. Fill in the blanks:
a). Joints of the bones help in the movement of the body.
b). A combination of bones and cartilage forms the skeleton of the body.
c). The bones at the elbow are joined by a hinge joint.
d). The contraction of the muscles pulls the bones during movement.
2. State true or false.
a). The movement and locomotion of all animals is the same (False)
b). The cartilage is harder than bone (False)
c). The Finger bone does not have joints (False)
d). The forearm has two bones (True)
e). Cockroaches have an outer skeleton (True)
3. Match the item in column I with one or more items in column II
Ans:
| 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 | Shoes have slow movement |
| Cockroach | Have an outer skeleton Can fly in the air |
4. Answer the following:
a. What is a ball and socket joint?
Ans: The ball and socket joint is a movable joint. A rounded end of one bone fits into the cavity (hollow space) of the other bone. This makes the bone able to move in all directions.
Example: Hip bone, shoulder bone.
b. Which of the bones in the skull are movable?
Ans: The lower jaw of the skull is movable.
c. Why can our elbow not move backwards?
Ans: Our elbow cannot move backwards because the elbow has a hinge joint that allows only back-and-forth movements.
Body Movement Extra Questions and Answers
Define body movement.
Ans: The ability of an organism to move from one place to another using its body parts is called body movements.
What is a joint? What are the different types of joints?
Ans: The place where two or more bones join together is called a joint. It allows the movement of bones.
There are four different types of joints.
1. Ball and socket joints
2. Pivotal joints
3. Hinge Joints and
4. Fixed jointsWrite one point of difference between pivotal joints and hinge joints.
Ans: Pivotal joints allow us to bend our head forward and backward and turn our head to our right or left.
Whereas, hinge joints allow only a back-and-forth movement.What is a fixed joint?
Ans: Fixed joints are immovable joints.
What are the functions of a skeleton?
Ans: The functions of the skeleton are:
1. It gives shape and support to the body.
2. it protects the internal organs.Name the various parts of a skeletal system.
The various parts of the skeletal system are:
Skull, backbone, ribs and breastbone, shoulder and pelvic bone and bones of hands and legs.Which organ is protected inside the bone of a skull?
Ans: Brain
What is the function of the rib cage?
Ans: The function of the rib cage is to protect the vital organs of our body.
How is cartilage different from bones?
Ans: Cartilages are some additional parts of the skeleton that are not as hard as bones. Unlike bone, cartilage can be bent.
How do muscles work in the bone movements?
Muscles always work in pairs. When one of them contracts, the bone is pulled in that direction while the other muscle of the pair relaxes. To move the bone in the opposite direction, the relaxed muscle contracts to pull the bones towards its original positions while the first relaxes. A muscle can only pull but cannot push. So, two muscles work together to move a bone.
How does an earthworm get a grip on the ground?
Ans: The tiny bristle under its body helps the earthworm to get a grip on the ground.
How do the following animals move?
a) Snails b) FishAns: Snails move with the help of thick, strong muscular feet.
Fish have streamlined body that allows it to move freely in water. The tail and other fins help in maintaining balance and keeping direction while swimming.What is slithering?
Ans: The movement of a snake is called slithering. Snakes do not move in a straight line.
Birds can fly in the air and walk on the ground. Give the reason why.
Ans: The Birds can fly in the air and walk on the ground because:
1. Their bones are hollow and light.
2. The hind limbs help in walking and perching
3. The forelimbs are modified as wings.
4. Strong shoulder bones and a modified breastbone are used to move the wings up and down.How is it possible that the cockroaches can walk, climb and fly in the air?
Ans: It is because cockroaches have three pairs of legs for walking and two pairs of wings for flying.
Body Movement Notes
Gait of animals.
(a) Earthworm: Earthworm has many rings joined end to end. An earthworm does not have bones and moves with the help of muscles. Its body secretes slimy substance and moves by muscle expansion and constriction. The tiny bristles under it help it to get a good grip on the ground.
(b) Snails: Snails move with the help of thick, strong muscular feet.
(c) Cmkroaches: It has three pairs of legs for walking and two pairs of wings attached to the body behind its head for flying. The body muscles move the Wings When it flies. It has distinct muscles that are used for movement.
(d) Birds Their bodies are well suited for flying as their bones are hollow and light. The hind limbs help in walking and perching. The forelimbs are modified as wings.
(e) Fish: Fishes have streamlined body that allows to move freely in the water. They use tail fins for small jerks through water and other fins help to keep the balance of the body and to keep direction while swimming.
(f) Snake: Snakes have a long backbone and thin muscles. The loop made by its body helps it to move forward. They move very fast but not in a straight line.
