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Class 6 science chapter 9 question answer
Today, I am sharing Class 6 science chapter 9 question answer. Hope it helps! For weight loss tips read: aerobic exercise at home for weight loss
Very short answer questions
1. How many types of girdles are found in human body? Name them.
ANSWER: There are two types of girdles found in the human type:
(a) pair of shoulder girdles
(b) pair of hip girdles
2. What kind of arrangement is found in the ball and socket joint?
ANSWER: Ball and socket joint is an freely movable joint. It allows maximum movement in all directions as ball-shaped end of one bone fits into the hollow cup-shaped socket of the other bone.
3. How many legs does a cockroach have?
ANSWER: Cockroaches have a 3 pair of jointed legs.
4. Where do you find hinge joint in your body?
ANSWER: Hinge joint is found in knees, elbow, toes and fingers.
Short answer questions.
1. What is a rib cage? What is the function of the rib cage?
ANSWER: 12 pairs of thin and curved bones are called as ribs. These ribs form a cage, which is called as rib cage. Protection of heart and the lungs is the function of the rib cage.
2. What are fixed joints? Give an example.
ANSWER: Fixed joints do not allow any movement between the bones. For example, bones of the skull (except the lower jaw bones).
3. Why do animals move from one place to another?
ANSWER: Animals move from one place to another which means they show locomotion because of many reasons:
(a) to find their food and water.
(b) to protect themselves from their predators and enemies.
(c) to find suitable places for laying eggs or rearing their young ones.
4. Why can’t we bend our elbows backwards?
ANSWER: We can’t bend our elbows backwards because they have hinge joints that allow movement of bones in one direction, that is, up and down or back and forth movement.
5. Why is mucus secreted by a snail’s foot?
ANSWER: Mucus which is called as slimy substance reduces the friction between foot and the ground surface. This enables the muscles of foot to move forward.
6. Shreya’s grandmother is very old. She has pain in her knee joint and thus, she finds it very difficult to move from one place to another. Shreya always helps her grandmother, when she walks.
(a) Name the type of joint found in the knee.
ANSWER: Hinge joint is found in the knee as knee shows movement in one direction only.
(b) What value do you learn from Shreya?
ANSWER: We should help and respect the old people.
Long answer questions.
1. Explain in brief the different types of movable joints in the human body.
ANSWER: There are four types of movable joints in the human body:
(a) The ball and socket joint: Ball and socket joint is an freely movable joint. It allows maximum movement in all directions as ball-shaped end of one bone fits into the hollow cup-shaped socket of the other bone. Example: shoulder and hip joint.
(b) Hinge joint: Hinge joints allows movement of bones in one direction, that is, up and down or back and forth movement. Example: finger, knees, toes and elbow joints.
2. How do the muscles attached to bones bring about movements?
ANSWER: The two muscles work together as a pair to move a bone.
(a) One muscle pulls the bone away from the joint by contracting the muscle attached to a bone.
(b) Another muscle pull the bone back in opposite direction.
3. How does a bird fly? List the features that help a bird to fly.
ANSWER: Birds fly because of the following features:
– They have streamlined bodies that cut the air current while flying.
– They have hollow bones that makes the body light.
– They have powerful chest muscles that help in flapping the wings during flight.
4. Describe the structure and function of the ribcage with the help of labelled diagram.
ANSWER: 12 pairs of thin and curved bones are called as ribs. These ribs form a cage, which is called as rib cage. Protection of heart and the lungs is the function of the rib cage.
HOTS (Higher Order Thinking Skills) questions
1. Why does a child have 300 bones whereas an adult who has grown up bigger in size has only 206 bones?
ANSWER: A child have 300 bones whereas an adult who has grown up bigger in size has only 206 bones because as the child grows, some of the bones fuse together and reduce in number.
2. Imagine yourself with a vertebral column with a long single bone or with fixed joints. How will such a change affect your life?
ANSWER: The joints, where vertebrae meet allows movement. It also provides support to the body. If the joints are fixed or with single bone then it does not allow us to bend or to twist our back.
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