Assertion   :       Ball and socket joints are the most mobile joints.

Reason      :       Synovial fluid is present here.

1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both the assertion and reason are false

Assertion   :       Arthritis or inflammation of a joint makes the joint painful.

Reason      :       Some toxic substances are deposited at the joint.

Assertion   :       Movement of body parts serves to change the body posture.

Reason      :       Body parts move in relation to body axis.

Assertion   :       There are similarities between the locomotion of unicellular organisms and multicellular animal.

Reason      :       Ciliary, flagellar and amoeboid movement occur in unicellular organisms.

Assertion   :       Starfish moves through crawling.

Reason      :       Starfish utilise a flow of water over the surface, for movement.

Assertion  :       Triceps is said to be an extensor muscle for elbow joint.             

Reason     :     Triceps relaxes durings extension of forearm at the elbow joint.

Assertion  :       Biceps and triceps are called antagonistic muscles.              

Reason     :     This is due to the fact that they contract and relax together.

Assertion   :       Muscle contraction force increases with rise in strength of stimulus.

Reason      :       This is due to increased contraction of individual muscle fibres with increase in stimulus strength.

Assertion   :       Muscle as a whole doesn’t obey All or None law.

Reason      :       Each muscle fibre contracts maximally whenever it contracts.

Assertion   :       Non-striated muscles are said to be voluntary in nature.

Reason      :       Non-striated muscles can be moved according to will.