The skeletal system is the framework of the body, consisting of bones and other connective tissues, which protects and supports the body tissues and internal organs. The human skeleton contains 206 bones.

In ball and socket joints, the rounded end of one bone fits into the cavity (hollow space) of the other bone. Thus, Option A is correct.

The head is not capable of movement. The movement of the head is due to the action of the joint present at the neck which is called the Pivot joint.
Hence the given statement is false.

Cockroaches walk and climb as well
as fly in the air. They have three pairs
of legs. These help in walking.There are two pairs of wings attached
to the body behind head which help in flying.
Hence the correct option is B.

Toes, neck and elbow are all capable of particular types of movements as they are all joints.
Hence the correct option is D.

While bowling a cricket ball, our shoulder undergoes complete rotation. Hence the movement involved here is that of the shoulder.
Hence the correct option is B.

Joints are regions in the body where 2 or more bones meet. These are the regions capable of exhibiting movement. Elbow, neck and shoulders are all joints.
Hence the correct option is D.

• The snake's body curves into many loops. 
• Each loop of the snake gives it a forward push by pressing against the ground. 
• Since its long body makes many loops and each loop gives it this push, the snake moves forward very fast and not in a straight line.

Hence the correct option is A.

Toes, neck and elbow are all capable of particular types of movements as they are all joints.
Hence the correct option is D.

Solution:

Correct answer is option A.

Explanation for correct option:

• As we know human body is made of skeleton. Skeleton is structure that keeps body in shape and helps in movement.
• In adult humans there are 206 bones in skeleton. Bones along with muscles and joints assists in various function in our body.
• The femur (thigh bone) is the longest bone in the human body and the shortest bone is the stapes found in the middle ear.

The normal average person is born with a total of 33 vertebrae in the vertebral column (backbone). By the time the person becomes an adult, some bones fuse and the number is reduced to 24.

The framework of the body, consisting of bones and other connective tissues, which protects and supports the body tissues and internal organs is called the skeletal system. 

• Bone forms the skeleton of the body. It is composed chiefly of calcium phosphate and calcium carbonate. 
• There are 206 bones in the body of an adult while approximately 300 in an infant.
• That eventually fuse (grow together) to form the 206 bones that adults have.

So, the correct answer is option D.

Bones are constituted of calcium in the form of calcium phosphate and calcium carbonate. The calcium present in bones provides strength and hardens the skeletal framework. Bones also contain a protein called collagen which is woven into a flexible network, providing flexibility to the framework.

The elbow is the joint connecting the upper arm to the forearm. It is classed as a hinge-type synovial joint. A hinge joint is a form of freely movable joint that allows angular movement in one plane only, increasing and decreasing the angle between the bones.

Skull: A bone framework enclosing the brain of a vertebrate; the skeleton of a person's or animal's head.