CBSE NCERT Class VI (6th) | Science | Biology
Chapter : Body Movements
CBSE NCERT Solved Question Answer
Q1 Define Joints. Name the various types of movable joints
A joint is a place where two or more bones meet. Various types of movable joints are- 1 ball and socket joint 2.Pivotal joint 3 .Hinge joint
Q2 Bones are hard and cannot be bent? How do we bend our limbs at the elbow and knees?
We can bend our limbs at the elbow and knees because of presence of hinge joint .
Q3 What are fixed joints ? Give its example.
Fixed joints do not allow any movement. eg. bones of our skull.
Q4 What is a ball and socket joint? Give its example.
In this type of joint ball of one bone is fitted in the socket of another bone .eg hip joint
Q5 How are we able to move our head up and down and sideways?
Q6 Name the joint that allows movement in one plane only?
Q7 Define pivotal joint.
In this joint rounded surface of one bone fits into the ring formed by the other.
Q8 What is the significance of human skeleton? (2 points)
1 It provides support to the body and give specific shape to it
2 It helps to protect delicate organs.
Q9 What is a rib cage?
Chest bone and backbone together form a box called ribcage
Q10What are the important organs protected by ribcage?
Heart and lungs
Q11How many bones are present in our shoulder?
Q12 Differentiate between bone and cartilage?
Bone is hard and inflexible and cartilage is soft and flexible
Q13What is the main function of a muscle and how does it work?
Muscles help in movement by contraction and relaxation. Muscles move bones by contracting
and thus pulling them but they cannot push back. That is why muscles work in pairs .One muscle pulls the bone away from the joint and another pulls it back.
Q14 Why do we say that earthworm are friends of farmers?
Earthworm decomposes organic waste and makes the soil more airy.
Q15 How does earthworm fix its body parts to the ground?
Bristles help to get a good grip on the surface of the ground.
Q16What area the special features that help a bird to fly?
Birds have following features-
1. Wings to fly.
2. streamlined body which reduces air resistance.
3. hollow bones which make them light in weight
Q17 What are the different body parts used by cockroach for its movements?
It has 3 pair of legs and 2 pairs of wings which helps it to fly and climb.
Q18 What is the significance of streamlined body in fishes?
This reduces water resistance and make it easy for fish to swim