Class 6 Science Chapter 5 MCQ

Snakes do not have legs, even then they move quite fast because a snake moves forward by moving its body sideways in the form of many loops and pushing against the ground.

When the fish’s tail moves side to side, it pushes the water sideways as well as back-wards. The backward push of tail on water, makes the fish move forward.

Snail have two sets of muscles in the foot of snail which contract and expand alternately, producing a kind of wave effect.

Hinge Joint allows the movement of bones in only one direction forward and backwards. In a hinge joint, the movement of bones is restricted to one direction by the shape of the ends of the bones which form the joint. Elbow, knee, knuckles (finger joints) and jaw are examples of hinge joints. And knee joint is also a hinge joint. But shoulder joint is an example of ball and socket joint.

Snail is a very slow-moving animal with a shell on its back. The foot of snail is large, flat and disc-shaped which is made of strong muscles. It is called muscular food. Snails are gastropods which means belly-footed animals. The movement of snail is called “creeping”.

Here, all the statements are correct. Hence, your answer will be option [D].

The plate type bones of our skull are held together by fixed joints and cannot move at all.

In the human body the upper arm consists of a single bone called humerus. The lower arm or forearm is from elbow to wrist. The lower arm or forearm is made up of two bones radius and ulna. The upper arm bone is connected to the lower arm bones by a hinge joint at the elbow.

Here, all the statements are correct. Hence, your answer will be option [D].

Here, all the statements are correct. Hence, your answer will be option [D].

The human body has two shoulders, one on each side of the neck as collarbone and shoulder blade. The collar bone is a long, curved bone and the shoulder blade is a large and flat triangular bone.

The shoulder blade is attached to the backbone by muscles to allow the free movement of the shoulder. Each shoulder blade has a cup shaped socket. The upper arm fits into the socket of shoulder blade forming ball and socket joints.

The bony framework inside our body is called a skeleton. In human beings, the skeleton is inside the body, so it is called an endoskeleton. Actually, our body is supported on a hard framework of bones. We can stand straight because of the “Internal skeleton”.

The lower arm is made up of two bones as radius and ulna.

There are 206 bones in the human skeleton or human body.

Here, all the statements are correct. Hence, your answer will be option [D].

Backbone is made up of 33 small bones placed one over the other.

The pivot joint allows rotation around an axis. A pivot joint exist between our skull and the top vertebra of backbone. Another pivot joint occurs in the forearm or lower arm near the elbow. The pivot joint in the forearm make us turn our forearm to hold the palm of hand up or down.

Here, all the statements are incorrect. Hence, your answer will be option [D].

If we open and close a door, we will find that the door can move only “forwards” and “backwards”. Actually, the door is joined to its frame by a small metal “joints” called “hinge”. These hinges allow the door to move only in one direction, “forwards and backwards”. We can move the lower jaw because the lower jaw is connected to the skull by a movable joint called hinge joint. The hinge joint in lower jaw allows the chewing of food.

Two muscles (a pair) work together to move a bone. When one muscles of the pair contracts, then the other muscles of the pair is relaxed. The alternate contraction and stretching brings about the movement.

Snail moves with the help of a large, disc-shaped muscular foot. The whole body of a snail is soft and consists of a head, a foot and a shell. Shell is the outer structure (skeleton) of a snail, but it is not made of bones.

The fin-like flippers worn by underwater divers help to swim easily in water. It mainly helps to keep the balance of the body and to keep direction, while swimming (just as fins in fishes).

Our bones and muscles together form the musculoskeletal system that enables the movement of body parts and the whole body from one place to another.

Here, all these statements are correct. Hence, your answer will be option [D].