Science [1 Marks Each] QUE - ANS

Name any three birds that cannot fly.

Activity.Let us look at the kind of movement allowed by a hinge. Make a cylinder with cardboard or thick chart paper, as shown in figure. Attach a small pencil to the cylinder by piercing the cylinder at the centre, as shown. Make a hollow half cylinder from cardboard such that the rolled up cylinder cati fit inside it easily. The hollow half cylinder with the rolled up cylinder sitting inside it, allows movement like a hinge. Try to move the rolled up cylinder. How does it move?

How is this movement different from what we saw with our constructed ball and socket joint?

What is the difference between bones and cartilage?

Why are at least two muscles needed to move a bone at a joint in one direction?

Does the shoulder bone also move when you move your arm?

Activity.Observe an earthworm moving on soil in a garden. Gently lift it and place it on a piece of blotting or filter paper. Observe its movement. Then place it on a smooth glass plate or any slippery surface. Observe its movement now.
Is it different from that on paper? In which of the above two surfaces do you find that the earthworm is able to move easily?

Provide one word answers to the statements given below.
Part of the skeleton that forms the earlobe.

Activity.Make a paper boat. Put it in water and push it with one narrow end pointing forward.
Did it go into the water easily? Now hold the boat sideways and push it into the water from the broad side. Are you able to make the boat move in water when you push it from this side?

Which type of movement would have been possible if:
Our elbow had a fixed joint.

Which of these animals have bones in their body.
Earthworm, snake, snail, fish, bird.

Name four different types of joints.

Write the type of joint which is used for the following movements:
A girl moves her head in right and left direction.

What are bones made up of?

Provide one word answers to the statements given below.
Part of the body with a fixed joint.

What is pivotal joint?

Which of the skull bones are movable?

What is function of rib cage?

Try to eat your food without moving the lower jaw. Do you find this difficult to do?

How are bones of bird modified to move wings up and down?

Provide one word answers to the statements given below.
Bones which enclose the organs of our body that lie below the abdomen.

How can earthworm move?

Write the special features that help a bird to fly.

Write the type of joint which is used for the following movements:
A cricket bowler bowls the ball.

How is earthworm useful for plants?

Which important organ is fully protected inside the bones of the skull (head)?

Which technique is used to find out possible bone injuries?

Why is earthworm regarded as farmer’s friend?

Write the type of joint which is used for the following movements:
A person lifts weights to build up his biceps.

Activity.Place a scale length-wise on your arm so that your elbow is in the centre.

Ask your friend to tie the scale and your arm together. Now, try to bend your elbow.
Are you able to do it?

How does earthworm gets grip on ground?

What are different functions of joints in our body?

Which muscles in cockroach helps the cockroach in walking?

Name organs that are protected by rib cage.

Name the bones which protect the heart from all sides.

What is exoskeleton?

What is a hinge joint?

Answer the following:
Which of the skull bones are movable?

Do all animals have bones?

Provide one word answers to the statements given below.
Bones that join with chest bone at one end and to the backbone at the other end.

Which is the longest bone in your body? Measure it with your scale.

Differentiate between ligament and tendon.

Where is cartilage found?

Why are the bones in the foot normally set in an arch?