Exercise:
1). Fill in the blanks.
a). Joints of the bones help in the movement of the body.
b). A combination of bones and cartilages forms the skeleton of the body.
c). The bones at the elbow are joined by a hinge joint.
d). The contraction of the muscles pulls the bones during movement.
2). Indicate true (T) and false (F) among the following statements.
a). The movement and locomotion of all animals is exactly the same.
(F)
b). The cartilages are harder than bones.
(F)
c) The finger bones do not have joints.
(F)
d). The forearm has two bones.
(T)
e). Cockroaches have an outer skeleton.
(T)
3). Match the items in Column I with one or more items of Column II.
Column I. Column II
1). Upper jaw. have fins
on the body.
2). Fish. has an outer skeleton.
3). Ribs. can fly in the air.
4). Snail is an immovable joint.
5). Cockroach protect the heart
Shows very slow movement
Have a streamlined body
Answer:
1). Upper jaw – is an immovable joint.
2). Fish – Have a streamlined body, have fins on the body
3). Ribs – protect the heart
4). Snail – Shows very slow movement
5). Cockroach – can fly in the air, has an outer skeleton.
4). Answer the following:
a). What is a ball and socket joint?
The rounded bone fits into the cavity of the other bone. Such a joint is called a ball and socket joint. This joint allows movements in all directions.
b). Which of the skull bones are movable?
In the skull only the lower jaw is movable.
c). Why can our elbow not move backward?
Elbow has a hinge joint that allows movement in only one direction, therefore, our elbow does not move backward.
Additional Questions:
1). Write the different ways in which animals move from one place to another?
Walk, run, fly, jump, creep, crawl, slither and swim – these are the different ways in which animals move from one place to another.
2). What are joints?
The places in the body where two parts of our body seem to be joined together are called joints.
3). Name the different types of joints found in a human body?
Ball and socket joints, pivotal joints, hinge joints and fixed joints are the types of joints found in the human body.
4). What are pivotal joints?
The joints where our neck joins the head is pivotal joint. It allows us to bend our head forward and backward and turn the head to our right or left.
5). What gives a shape to our body?
All the bones in our body form a framework to give a shape to our body. This framework is called skeleton.
6). What are carples?
Several small bones that make the wrist are called as carples.
7). What is a skull?
A skull is made up of many bones joined together. It encloses and protects a very important part of the body, the brain.
8). What is cartilage?
Additional parts of the skeleton that are not as hard as the bones and which can be bent are called cartilage.
true or false
1). bones cannot be bent.
false
2). we can bend or move our body where bones meet.
true
3). hinge joints allow only a back and forth movement.
true.
4). we can move our upper jaw.
false
5). x-ray images are used to find possible injuries that might have happened to the bones.
true.
6). cartilage is found in the ear lobe.
false
7). when contracted the joint becomes shorter, stiffer and thicker.
false
8). muscles work in pairs.
true
9). shell of a snail is made up of bones.
false.
10). snakes have a long backbone.
true.
2). Wrist is made up of several small bones called carples.
3). There are 12 ribs on each side of the chest.
4). The backbone consists of 33 vertebrae.
5). Cockroaches have three pairs of legs.
6). Cartilage is found in the joints of the body.
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