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NCERT Solutions for Class 8 Science - Body Movements

Q1: Fill in the blanks:
(a) Joints of the bones help in the __________ of the body. 
Ans: Movement

(b) A combination of bones and cartilage forms the __________ of the body. 
Ans: Skeleton

(c) The bones at the elbow are joined by a __________ joint. 
Ans: Hinge joint

(d) The contraction of the __________ pulls the bones during movements. 
Ans: Muscles

Bicep MusclesBicep Muscles

Q2: Indicate true (T) and false (F) among the following sentences.
(a) The movement and locomotion of all animals is exactly the same. 
Ans: False

(b) The cartilage are harder than bones. 
Ans: False

(c) The finger bones do not have joints. 
Ans: False

(d) The fore arm has two bones.
Ans: True

(e) Cockroaches have an outer skeleton. 
Ans: True


Q3: Match the items in Column I with one or more items of Column II.
NCERT Solutions for Class 8 Science - Body Movements

Ans:
NCERT Solutions for Class 8 Science - Body Movements


Q4: Answer the following:
(a) What is a ball and socket joint?
Ans: The rounded end of one bone fits into the cavity (hollow space) of the other bone. Such a joint allows movements in all directions, which is called a ball and socket joint.

(b) Which of the skull bones are movable? 
Ans: The lower jaw bone or mandible is the only movable bone in the skull.  

Lower JawLower Jaw(c) Why can our elbow not move backward? 
Ans: Elbow joint is composed of the hinge joint. These joints allow movement in one plane and up to 180° only. Hence, we cannot move our elbows backward.

The document NCERT Solutions for Class 8 Science - Body Movements is a part of the Class 6 Course Science Class 6.
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FAQs on NCERT Solutions for Class 8 Science - Body Movements

1. What are the different types of body movements?
Ans. There are four main types of body movements: 1. Flexion: This is the movement that decreases the angle between two body parts. For example, bending your arm at the elbow. 2. Extension: This is the movement that increases the angle between two body parts. For example, straightening your arm at the elbow. 3. Abduction: This is the movement of a body part away from the midline of the body. For example, moving your arm away from your body. 4. Adduction: This is the movement of a body part towards the midline of the body. For example, bringing your arm back towards your body.
2. How do muscles help in body movements?
Ans. Muscles play a crucial role in body movements. They are responsible for generating the force needed to move the bones of our body. When a muscle contracts, it pulls on the bones it is attached to, causing them to move. Muscles work in pairs, with one muscle contracting and the other relaxing to allow movement. The muscles in our body are connected to the bones through tendons, which transmit the force generated by the muscles to the bones.
3. What is the skeletal system and how does it support body movements?
Ans. The skeletal system is the framework of bones that provides support and structure to our body. It consists of 206 bones that are connected to each other through joints. The skeletal system supports body movements by providing a rigid structure for the muscles to attach to. When muscles contract, they pull on the bones, causing them to move. The joints allow for smooth and controlled movements by providing flexibility and allowing bones to move in different directions.
4. How do joints facilitate body movements?
Ans. Joints are the points where two or more bones meet. They play a crucial role in facilitating body movements. Joints provide flexibility and allow bones to move in different directions. There are different types of joints in our body, such as hinge joints, ball-and-socket joints, pivot joints, and gliding joints. Each type of joint allows for specific types of movements. For example, hinge joints allow for movements like bending and straightening, while ball-and-socket joints allow for movements in multiple directions.
5. Why is it important to have a good posture for maintaining proper body movements?
Ans. Having a good posture is essential for maintaining proper body movements. It helps in aligning the bones and joints in the correct position, which allows for efficient movement and reduces the risk of injuries. Poor posture can lead to imbalances in the muscles and joints, causing strain and discomfort. It can also affect the functioning of the skeletal system and lead to long-term health issues. Maintaining a good posture while sitting, standing, and exercising is important for overall body health and proper body movements.
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