Science [1 Marks Each] M.C.Q.

Cockroaches.

Skull.

Both the above.

Bone marrow.

Cartilage.

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 snail, but it is not made of bones.

Skull.

A snail moves with the help of muscular foot.

Both have streamlined body.

In a pivotal joint a cylindrical bone rotates in a ring.

Back bone is made up of many small bones.

The earthworm, actually, eats its way through the soil. The body then throws the undigested part of the material that it eats. In this way, the earthworm makes the soil more useful for plants.

Pinnae of ears.

Cartilage.

All the above.

Hinge, pivotal, ball and socket, fixed.

Upper jaw and skull joints are immovable or fixed. Bones are held, so tightly together that they cannot move at all. The other options are:
Shoulder and arm Ball and socket joint.
Knee and joint Hinge joint.
Lower jaw and upper jaw Hinge joint.

The bones in elbow have hinge joint that allows only back and forth movement.

 Rib cage protects our lungs, heart and wind pipe.

Tissues.

By alternate contraction and relaxation of two sets of muscles.

Sternum.

Our muscles along with other body systems such as nervous system and circulatory system work together to move our bones.

All of the above.

Pivotal joint.

The streamlined body, fins and tail help a fish to move in water.

Ball and socket joint.

Bone is hard and firm whereas cartilage is soft and can be bent or can bend.

Snail does not have both muscles and skeleton for movement. The shell (i.e. external skeleton) 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 musculoskeletal system for movement.

Forming loops alternately on two sides of the body.

Muscles.

Cartilages are found in joints. There are no bones in earthworm. The earthworm moves by alternate extension and contraction of body using muscles (not bristles).

Muscular foot.

Cockroaches have an outer skeleton.

 Shell is not made of bones.

All the above.

Kidneys.

Make the front part of its body curve to one side and tail part to the opposite site.

A muscle can only pull and not push. It is because of this that we need a pair of muscles to move a bone. The bones are moved by alternate contractions and relaxation of two sets of muscles.

Ball and socket joint.

Skeletal system provides attachment points for muscles.

All of these

Both the above.