NCERT Solutions for Class 6 Science Chapter 8 - Body Movements
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1. Fill in the blanks:
a) Joints of the bones help in the --------------- of the body.
Ans: Joints of the bones help in the movement of the body.
b) A combination of bones and cartilages forms the --------- of the body.
Ans: A combination of bones and cartilages forms the skeleton of the body.
c) The bones at the elbow are joined by a -------- joint.
Ans: The bones at the elbow are joined by a hinge joint.
d) The contraction of the ---------- pulls the bones during movement.
Ans: The contraction of the muscles pulls the bones during movement.
2. Indicate true (T) and false (F) among the following sentences.
a) The movement and locomotion of all animals are exactly the same.
Ans: False because the movement and locomotion of animals depend on their body structure. So, animals with different body structures possess different modes of movement.
b) The cartilages are harder than bones.
Ans: False because they are not as hard as bones and can be bent easily.
c) The finger bones do not have joints.
Ans: False as finger bones also have joints.
d) The forearm has two bones.
Ans: True. They are the ulna and the radius.
e) Cockroaches have an outer skeleton.
Ans: True and it is known as the exoskeleton.
3. Match the items in Column I with one or more items of Column II.
have fins on the body.
an outer skeleton.
can fly in the air.
is an immovable joint
protect the heart.
Shows very slow movement.
Ans: The correct match of the items given in column A is as follows-
is an immovable joint
have fins on the body and have a streamlined body.
protect the heart.
Shows very slow movement.
an outer skeleton and can fly in the air.
4. Answer the following:
a) What are a ball and socket joint?
Ans: The ball and socket joint is made up of two bones. One of which is rounded and the other bone forms a socket. This allows both bones to fit perfectly and allow rotary motion in every direction. This type of joint is present at the shoulders and thighs of the body.
b) Which of the skull bone is movable?
Ans: Lower jaw bone of the skull or mandible is the only movable bone of the skull.
c) Why can our elbows not move backwards?
Ans: Our elbow joint is a hinge joint. These joints allow movement in one plane and up to 180o only. Hence, we cannot move our elbows backwards.
NCERT Solutions for Class 6 Science – Free PDF Download
Cbse Class 6 Science Chapter 8 Body Movements notes and lessons are available through the PDF files from Vedantu. Visit the site and download Body Movements Class 6 pdf, instantly. Ncert Class 6 Science Chapter 8 available at the site will help students to score more in their exams.
NCERT Solutions for Class 6 Science Chapter 8 – Body Movements
8.1 Human Body and its Movements
There are many parts of the human body system. Each is responsible for performing specific bodily functions. An organ in our body is made from a group of tissues that work together to help mechanism work properly. Our body has an internal framework made by cartilages and bones and is known as the skeletal system. It provides us with stability and helps us to move. Furthermore, there are different parts in the skeletal system consisting of – backbone, skull, shoulder and hip bones, chest bone, arm bones and shinbone.
Socket and Ball Joints
As per the note stated in Body Movements Class 6 lessons, in one body, there are different kinds of joints. When a round-end bone connects another bone through the cavity, the connection is said to be a ball and socket joint. This type of joint allows movement of bones to every direction. Examples include the upper arm and shoulder joints.
If a joint looks like a ball on a stick – it is called a pivotal joint. It allows rotation in diagonal and vertical directions. The joint in between backbone and skull is a pivotal joint. It is a joint that allows rotation.
The hinge joints are very similar to the hinges attached to the doors. It allows extension and flexion in a particular plane. For example, the elbow joint. It means hinge joints can move in a fixed axis.
In the studies of Body Movements Class 6, fixed joints is an example of the cranium. That means when two bones join, but still, movement isn’t possible- it is called a fixed joint. Try moving your upper jaw, you will notice that only the lower jaw drops down and the upper one stays intact. This is the perfect example of a fixed joint. Our skull is also an example of a fixed joint as multiple plates are attached, but the movement isn’t allowed.
8.2 Gait of Animals
Download NCERT Solutions for Class 6 Science Chapter 8 to acquire in-depth knowledge of gaits and movement abilities in animals. To make it simpler for Class 6th Science Chapter 8, gait is the pattern followed by limbs when moving during locomotion on a solid substrate. Various types of gaits are used by animals depending on the overall body structure. The type of gait is based on terrain, speed, need for manoeuvring, and energy efficiency.
With the help of setae, earthworms can move. Their body is made of multiple rings which are joined by the ends. As they don’t have bones in their body, the muscles help them to extend and shorten. This further helps in moving around. The expansion and contraction of muscles make it possible for the earthworms to move forward in small distances.
A snail moves around with its shell, and that is the outer skeleton of the body. The exciting part is, it is not made of bones. To move around, a snail uses its head. The foot is its thick structure which is made of strong muscles. Beneath the muscles, they are lubricated with mucus for the ease of movement. The mucus also reduces the risk of injury when moving through sharp objects.
Cockroaches can walk like most of the insects. They can also climb and fly. They are equipped with three pairs of legs on each side, thus, together making six legs. The legs help them in moving faster. The upper or outer part of the body consists of a hard skeleton which is made of different units. They are attached, and this further helps them in moving.
The body of fishes is streamlined so that they can move freely through the water. The shape of the body also helps in the movement. As the tail and head of fishes are shorter and narrower than the middle portion of the body, it helps to penetrate through the volume of water and move forward.
Birds have legs and a pair of wings that help them to walk and fly, respectively. Even some birds can swim. Birds can fly because they have light and hollow bones and thus, make them suitable for flying. Also, they don’t have a urinary bladder that makes the body even lighter.
How do Snakes Move?
Snakes move in loops that look like “S” or zigzag patterns. They don’t have a lot of bones in their body, and the muscles give them the strength to move forward. Each loop is made like steps and pushes them forward. The muscles interconnect the ribs, backbone and skin.
Exercise 8.2 total Solutions: 6 Questions (3 short questions and 3 Long questions).
Key Features of NCERT Solutions for Class 6 Science Chapter 8
If students are looking for an expanded or detailed knowledge on Body Movements or any subject on Science NCERT Science Class 6 Chapter 8 solutions can be the right choice. The lessons are provided in an accurate way that helps the students acquire each aspect of the knowledge in the best way possible. Some of the key features of downloading ch 8 Science Class 6 notes are:
The notes are provided by experts in the industry.
The notes will help in achieving extra marks in the exams.
Tough topics are easily portrayed to parallel the understanding level of Class 6.
FAQs (Frequently Asked Questions)
Q1. Statement - Two muscles are needed to move a bone. True or False.
Ans. It’s true because muscles can only pull but cannot push. This is the reason, two muscles are required to move a bone. The muscle contraction helps the bone to move.
Q2. How Does a Fish Move in Water?
Ans. A fish moves by penetrating the volume of water in front of it. It is possible as their body is streamlined and the head and tail of the body are shorter and narrower than the rest of the body. The tail further helps to sway away from the water so that the fish can move.