Class 6 Science Chapter 5 Case Based Questions - Body Movements

Case 1: Skeletal System

Sarah is a 10-year-old girl who loves to play sports. Recently, she fell during a game and injured her rib cage. She's curious about the bones in her body.

Q1: Explain to Sarah what the rib cage is and its function.
Ans: The rib cage is a cone-shaped bony cage formed by 12 pairs of ribs that are attached to the vertebral column. It protects vital organs like the lungs and heart.

Q2: Sarah wants to know why her rib cage is important. How would you explain it to her?
Ans: Your rib cage is important because it acts like armor, keeping your delicate organs safe from harm.

Q3: Which type of joint allows movement in all directions?
(a) Hinge joint
(b) Gliding joint
(c) Ball and socket joint
(d) Fixed joint
Ans: (c) Ball and socket joint

Case 2: Animal Locomotion

John is studying different animals and their methods of locomotion for his science project.

Q4: Describe how an earthworm moves and the role of its bristles.
Ans: Earthworms move by contracting and expanding alternate portions of their body. Bristles on the ventral surface help them grip the ground.

Q5: Explain why an earthworm contracts and expands alternate portions of its body during movement.
Ans: Earthworms contract the front part, grip the ground with bristles, and then drag the posterior portion forward, repeating this process to move.

Q6: What type of joint allows only one-plane movement of up to 180⁰?
(a) Ball and socket joint
(b) Pivot joint
(c) Hinge joint
(d) Gliding joint
Ans: (c) Hinge joint

Case 3: Bird Adaptations

Emma is fascinated by birds and wants to learn how they are adapted for different forms of locomotion.

Q7: Describe the adaptations of a bird's skeleton for both walking and flying.
Ans: A bird's skeleton is adapted for walking with light and strong bones. For flying, they have wings and tail feathers.

Q8: Explain the role of feathers in a bird's ability to fly.
Ans: Feathers provide lift and help birds control their direction during flight.

Q9: What helps a snake move forward by making loops on its sides?
(a) Wings
(b) Muscles
(c) Ribs
(d) Bristles
Ans: (b) Muscles

Case 4: Fish Locomotion

Alex is studying fish and their swimming techniques for his biology project.

Q10: Describe the streamlined body of a fish and its importance in swimming.
Ans: Fish have streamlined bodies to reduce water resistance while swimming.

Q11: Explain how the tail fin of a fish aids in changing direction during swimming.
Ans: The tail fin of a fish helps change direction by adjusting its position in the water.

Q12: What type of joint allows movements in many planes, such as up and down and side to side?
(a) Hinge joint
(b) Gliding joint
(c) Pivot joint
(d) Ball and socket joint
Ans: (c) Pivot joint

Case 5: Skeletal Protection

Lily is learning about the protective functions of the human skeleton.

Q13: Explain how the rib cage protects vital organs like the lungs and heart.
Ans: The rib cage protects the lungs and heart by forming a bony cage around them.

Q14: Describe the role of the vertebral column in providing support to the body.
Ans: The vertebral column provides support and allows flexibility for movements.

Q15: How does a snail primarily achieve locomotion?
(a) Muscular foot
(b) Wings
(c) Jointed legs
(d) Slithering movement
Ans: (a) Muscular foot