Olympiad Test: Body Movements - Class 6 MCQ

Hinge joint allows movement in one direction only, enabling a back and forth motion. Key features include:

• Found in the knee, elbow, fingers, and toes.
• Facilitates actions like bending and straightening.

Topic in NCERT: Hinge joints

Line in NCERT: "The elbow has a hinge joint that allows only a back and forth movement."

The skeletal system is the framework of bones that supports our body and keeps it upright.

Key Points:

• The skeletal system is essential for maintaining posture.
• It provides the structure and shape of the body.
• Bones and cartilage form the skeleton, aiding in movement.

Reference from NCERT:

"Bones and cartilage form the skeleton of the human body. It gives the frame and shape to the body and helps in movement."

The elbow has a hinge joint, which allows for a simple back-and-forth movement. This type of joint is also found in the knee.

Key Points:

• The hinge joint permits movement in one direction.
• It is essential for activities like bending and straightening the arm and leg.
• Hinge joints are crucial for daily functions, such as walking and lifting.

Reference from NCERT: "The elbow has a hinge joint that allows only a back and forth movement."

Earthworm: Earthworms move by contracting and expanding their body segments. They possess both circular and longitudinal muscles, which enable this movement.

Key points about Earthworm movement:

• Movement occurs through contraction and expansion of body segments.
• Utilises circular and longitudinal muscles.

Topic in NCERT: GAIT OF ANIMALS

Line in NCERT: "Earthworms move by alternate extension and contraction of the body using muscles."

Cockroach can walk, climb and can also fly in air. The muscles in the breast region move the legs for walking while another set of breast muscles move the wings during flying.

Topic in NCERT: Cockroach

Line in NCERT: "Cockroaches walk and climb as well as fly in the air."

Ball and socket joint allows movement in many directions. The shoulder joint and hip joint are examples of ball and socket joint.

Topic in NCERT: Ball and socket joints

Line in NCERT: "Such a joint allows movements in all directions."

Some birds, such as ducks and swans, can swim in water.

These birds have specific adaptations that enable them to thrive in aquatic environments:

• Flippers: Ducks and swans possess flippers that assist in swimming.
• Body Shape: Their streamlined bodies reduce water resistance.
• Feathers: They have waterproof feathers that keep them dry.

Topic in NCERT: Birds

Line in NCERT: "Some birds like ducks and swans also swim in water."

- Snakes are vertebrates with a backbone, unlike spiders, starfish, and snails.

- Vertebrates have a spinal column for support and movement.

Topic in NCERT: How do snakes move?

Line in NCERT: "Snakes have a long backbone."

The snail moves using a muscular foot. This foot:

• Contracts and expands to create movement.
• Produces a wave-like motion that helps it glide over surfaces.

Topic in NCERT: Snail
Line in NCERT: "The thick structure is its foot, made of strong muscles."

The shoulder features a ball and socket joint, which allows for movement in all directions. This joint enables the arm to rotate freely.

Topic in NCERT: Ball and socket joints

Line in NCERT: "The bowl is like the part of the shoulder to which your arm is joined."

Fins help the fish to move in water. The forward movement of the fish starts with front and sideways push of the tail. The flexible and strong tail fin of the fish pushes the water and propels the fish forward.

Topic in NCERT: Fish Movement

Line in NCERT: "The fish forms a curve as shown in Fig. 5.24. Then, quickly, the body and tail curve to the other side. This makes a jerk and pushes the body forward. A series of such jerks make the fish swim ahead. This is helped by the fins of the tail."

Earthworms move using tiny bristles known as setae. These bristles grip the ground, allowing the earthworm to move effectively.

Key Features:

• Earthworms possess numerous tiny bristles under their bodies.
• These bristles are connected to muscles, enhancing movement.
• The bristles provide a strong grip on the ground.

Topic in NCERT: Gait of animals
Line in NCERT: "Under its body, it has a large number of tiny bristles (hair-like structures) projecting out. The bristles are connected with muscles. The bristles help to get a good grip on the ground."

The skull is a bony structure that serves to protect the brain from injury.

Key points:

• The skull is composed of multiple bones joined together.
• It encases and safeguards the brain, a vital organ.

Topic in NCERT: Fixed joints

Line in NCERT: "The skull is made up of many bones joined together. It encloses and protects a very important part of the body, the brain."

The shoulder has a ball and socket joint that enables circular movement. This is essential for a bowler in cricket, as it allows the arm to rotate fully while bowling.

Key features of the ball and socket joint:

• Allows movement in all directions.
• Facilitates a wide range of motion.
• Essential for activities requiring arm rotation.

Topic in NCERT: Ball and socket joints

Line in NCERT: "Such a joint allows movements in all directions."

Muscles contract to pull on bones, enabling movement. This process is facilitated by tendons, which connect muscles to bones.

Key functions of the skeletal system:

• Provides attachment points for muscles.
• Gives the body its shape and structure.
• Supports movement when muscles contract.

Topic in NCERT: Skeleton

Line in NCERT: "Bones and cartilage form the skeleton of the human body. It gives the frame and shape to the body and helps in movement."