Class 6 Science Chapter 5 MCQ

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.

Snails are “gastropods” which means “belly-footed animals”. The movement of snail is called creeping. In a way, the movement of a snail is similar to that of an earthworm.

In birds, the backward movement of wings pushes the air in backward direction. This air pushes the wings in the forward direction and makes the bird move forward. Thus, during the downstroke of wings, the air is pushed downward and backwards. The equal and opposite reaction force of air pushes the bird up and forward, and makes it fly.

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.

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

Shoulder joint and hip joint are the examples of ball and socket joints. In the ball and socket joint, one end of the bone has a round shaped like a ball which fits into a socket in the other bone. A ball and socket joint allows much more movement of bones than any other joints found in the human body.

Cartilage is also found on the ends of bones where they meet one another at a joint. Cartilage is also present between the vertebrae of backbone as cartilage disc.

Femur, or thighbone, is the largest bone in our body. The head of our femur fits into our hip socket and the bottom end connects to our knee.

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

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

Our skeleton consists of hard bones. However, at some places in the skeleton, there is a material which is not as hard as bones and which can be bent easily. That is called cartilage. Cartilage is a kind of softer and elastic bone which is present in nose, ear and the end of bones where they meet one another at a joint.

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

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

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.

Snake moves forward by moving its body sideways in the form of many loops, and pushing against the ground. The special name of the wave like motion of the snake is called “slither”. And also remember, snake does not move in a straight line because the sideways pushes of the loops push the snake forward as well as sideways.

Snails are “gastropods” which means “belly footed animals”. The movement of snail is called creeping. Remember, an earthworm, however, moves much faster than a snail.

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).

Snail does not have both muscles and skeleton for movement. The shell serves for muscles attachment and protection. The movement is carried out only with the help of large disc-shaped muscular foot that has two sets of muscles. In earthworm, a hydrostatic skeleton (fluid filled cavity surrounded by muscles) is present. The alternate contraction and relaxation of muscles and pressure of the fluid helps in burrowing. Dog and human beings have Musculo-skeletal system for movement.

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].