Summary: Movement in animals is possible due to bones and muscles. Different animals have different types of movement and skeletal systems.
NCERT Exercise Questions & Answers
Q1. What are joints?
Joints are places where two bones meet. They help in movement.
Q2. Name different types of joints.
Ball and socket joint, hinge joint, pivot joint, fixed joint.
Q3. What is a ball and socket joint?
It allows movement in all directions. Example: Shoulder, hip.
Q4. What is a hinge joint?
It allows movement in one direction only. Example: Elbow, knee.
Q5. What is a skeleton?
The framework of bones in the body is called the skeleton.
Q6. What is cartilage?
Cartilage is a soft and flexible tissue found at joints and in parts like ears and nose.
Q7. How do muscles help in movement?
Muscles contract and relax to move bones.
Q8. How do snakes move?
Snakes move by forming loops and pushing against the ground using their muscles.
Q9. How do birds fly?
Birds fly using wings and strong muscles.