Important Questions Test: Body Movements - Class 6 MCQ

Animals exhibit various ways of moving from one place to another due to differences in their body structure. This diversity in movement methods is a result of their evolutionary adaptations to their specific environments, which dictate how they navigate and survive in their surroundings.

Topic in NCERT: BODY MOVEMENTS

Line in NCERT: "Why do different animals have the body parts that they do have and how do these body parts help animals to move the way they do?"

Snakes primarily use their whole body for moving from place to place. Their unique anatomy allows them to slither and crawl efficiently without the need for legs, enabling them to navigate various terrains and environments.

Topic in NCERT: How do snakes move?

Line in NCERT: "Snake have a long backbone. They have many thin muscles."

Humans primarily move from place to place by walking. Walking is a fundamental mode of transportation for humans, allowing them to travel efficiently on land by using their legs and feet to propel themselves forward.

Topic in NCERT: Body Movements

Line in NCERT: "You also move from one place to another - - you get up and go to your teacher or to the school compound, or go home after school. You walk, run, skip, jump and move from place to place."

Joints in the human body primarily function to enable movement. These points of articulation between bones allow for flexibility and motion, facilitating various activities such as bending, rotating, and extending different body parts.

Topic in NCERT: Human Body and its Movements

Line in NCERT: "we can bend or move our body only at those points where bones meet."

A ball and socket joint, like the shoulder joint, allows for movements in all directions due to one bone's rounded end fitting into the cavity of another bone. This design enables a wide range of motion, making it one of the most flexible types of joints in the body.

Topic in NCERT: Ball and socket joints

Line in NCERT: "The rounded end of one bone fits into the cavity (hollow space) of the other bone."

A pivotal joint is the type of joint that allows movements like bending the head forward and backward and turning it to the right or left. This joint involves a cylindrical bone rotating within a ring, enabling these specific movements.

Topic in NCERT: Pivotal Joint

Line in NCERT: "The joint where our neck joins the head is a pivotal joint. It allows us to bend our head forward and backward and turn the head to our right or left."

A hinge joint, like the one at our elbow, permits movement in only one plane, allowing for a back-and-forth motion. This type of joint is akin to the movement observed when opening and closing a door on its hinges.

Topic in NCERT: Hinge joints

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

A fixed joint is present between the upper jaw and the rest of the head, restricting movement in this area. This type of joint is crucial for maintaining stability and support in certain parts of the body.

Topic in NCERT: Fixed joints

Line in NCERT: "Such joints are called fixed joints. There is a joint between the upper jaw and the rest of the head which is a fixed joint."

Ball and socket joints offer a greater range of motion compared to hinge joints. The spherical head of one bone fits into the cup-like socket of another, enabling movements in multiple directions, including rotation, flexion, extension, abduction, and adduction.

Topic in NCERT: Hinge Joints

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

The rib cage is the structure in our body that encloses and protects some vital internal organs such as the heart and lungs. It consists of 12 ribs on each side of the chest, joining the chest bone and the backbone together to form a protective box. This structure plays a crucial role in safeguarding internal organs and supporting the body's overall structure.

Topic in NCERT: Fixed Joint

Line in NCERT: "The ribs are curiously bent. They join the chest bone and the backbone together to form a box. This is called the rib cage. There are 12 ribs on each side of chest. Some important internal parts of our body lie protected inside this cage."

Muscles work in pairs to enable different types of movements in our body. When one muscle in the pair contracts, it pulls the bone in a particular direction while the other muscle relaxes. This coordinated effort allows for a wide range of movements, ensuring flexibility and agility in our daily activities.

Topic in NCERT: Fixed Joints

Line in NCERT: "Muscles work in pairs. When one of them contracts, the bone is pulled in that direction. The other muscle of the pair relaxes. To move the bone in the opposite direction, the relaxed muscle contracts to pull the bone towards its original position, while the first relaxes. A muscle can only pull. It cannot push. Thus, two muscles have to work together to move a bone."

Cartilage in the human body serves the purpose of facilitating smooth movement at joints. It is a flexible and resilient connective tissue that covers the surface of bones at joints, reducing friction and allowing for seamless motion. Cartilage plays a crucial role in ensuring joint flexibility and protecting bones from wear and tear during movement.

Topic in NCERT: THINGS TO THINK ABOUT

Line in NCERT: "Healthy bones, muscles, joints and cartilages are needed by the body for all these movements."

Muscles are primarily responsible for contracting and pulling bones during movement in the human body. When a muscle contracts, it becomes shorter, stiffer, and thicker, exerting force on the attached bones and causing movement. This coordinated action of muscles plays a key role in enabling various bodily movements, from simple gestures to complex physical activities.

Topic in NCERT: Fixed Joints

Line in NCERT: "When contracted, the muscle becomes shorter, stiffer and thicker. It pulls the bone."

Earthworms move through soil by slithering using muscle expansion and contractions to extend and shorten their bodies. This movement allows them to navigate through the soil efficiently, aiding in aerating the soil and enhancing its quality for plant growth.

Topic in NCERT: GAIT OF ANIMALS

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

The bristles under an earthworm's body serve the purpose of gripping the ground. These tiny hair-like structures connected to muscles help the earthworm get a good hold on the soil, enabling it to move effectively and navigate its environment.

Topic in NCERT: GAIT OF ANIMALS

Line in NCERT: "The bristles help to get a good grip on the ground."

The rounded structure on a snail's back is called a shell. Although it is the outer skeleton of the snail, it is not made of bones. The shell is a protective covering that the snail carries along and does not aid in its movement.

Topic in NCERT: Snail

Line in NCERT: "This is called the shell and it is the outer skeleton of the snail, but is not made of bones."

Cockroaches have three pairs of legs (a total of six legs) that help them walk. Each pair is attached to a different segment of the thorax, allowing for coordinated movement and agility as they navigate their environment.

Topic in NCERT: Cockroach

Line in NCERT: "Cockroaches walk and climb as well as fly in the air. They have three pairs of legs. These help in walking."

Birds possess several characteristics that enable them to fly:

• Hollow and light bones: Birds have a lightweight skeleton to reduce body weight, facilitating flight.
• Strong shoulder bones: These bones anchor powerful flight muscles, essential for wing movement.
• Modified forelimbs as wings: Birds' forelimbs have evolved into wings, providing lift and the ability to maneuver in the air.
• Thus, the correct answer is D: All of the above, as all these adaptations are crucial for flight in birds.

The streamlined shape of a fish facilitates movement in water by allowing water to flow around it easily. This reduces resistance and enables the fish to swim efficiently.

Topic in NCERT: Fish

Line in NCERT: "The shape is such that water can flow around it easily and allow the fish to move in water."

The fins on a fish's body primarily serve to maintain balance and direction while swimming. These fins help the fish stabilize itself and navigate through water effectively.

Topic in NCERT: Fish

Line in NCERT: "Fish also have other fins on their body which mainly help to keep the balance of the body and to keep direction, while swimming."

Cartilage, a firm, flexible connective tissue, is found in various parts of our body. The correct answer to the question is:
- Cartilage is present in the outer parts of the ear, providing structure and shape.
- It is also located at the end of the nose, supporting and shaping the tip.
- Cartilage acts as a cushion and support between the vertebrae of the backbone, known as intervertebral discs.
Therefore, the correct answer is D: all of the above, as cartilage is indeed found in these locations.

Topic in NCERT: Fixed Joints

Line in NCERT: "These are called cartilage. Cartilage is also found in the joints of the body."

Bones are crucial for movement in the human body as they serve as anchor points for muscles. Muscles attach to bones at specific locations, allowing them to exert force and generate movement when contracted. This muscle-bone interaction enables the body to perform a wide range of movements and activities.

Topic in NCERT: Summary

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. It protects the Inner organs"

The skeleton serves as the framework of the human body, providing shape, support, and structure. It plays a vital role in protecting internal organs, facilitating movement, and maintaining posture.

Topic in NCERT: Fixed joints

Line in NCERT: "All the bones in our body also form a framework to give a shape to our body. This framework is called the Skeleton "

The backbone in the human body consists of 33 vertebrae. These small bones called vertebrae make up the structure of the backbone, providing support, protection, and flexibility to the spinal cord. Each vertebra plays a specific role in maintaining posture, allowing movement, and protecting the spinal cord.

Topic in NCERT: Fixed Joints

Line in NCERT: "The backbone consists of 33 vertebrae."

Snails have a muscular foot on the underside of their bodies that they use to move. This foot contracts and relaxes in a wave-like motion, allowing the snail to glide slowly along surfaces. To aid movement, snails secrete a layer of mucus that helps reduce friction and provides a smoother path for travel. This process is distinct from flying, jumping, or swimming.

Topic in NCERT: Snail

Line in NCERT: "Snails move with the help of a muscular foot."