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.

Generally, in human body radius, ulna, humerus are found in arm but femur is found in thigh or upper leg.

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.

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.

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.

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

The rib cage protects the delicate internal organs like heart, lungs and liver. Brain is protected by skull.

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

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.

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.

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].

Birds can fly because their bodies are adapted or modified for flying purposes. As their flight feathers provide a large flat surface which is light but strong. Their bones are hollow and light. And their bodies are streamline and extremely light. Birds have breast bone which is extended for the attachment of large flight muscles (which moves the wings up and down).

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

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.

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 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].