Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R): 
 

Assertion (A):	Slow twitch fibers can sustain action for a long period of time without fatigue.
Reason (R):	They can respire anaerobically by using a large store of glycogen and high concentration of glycolytic enzymes.

In the light of the above statements choose the correct answer from the options given below:

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	Both (A) and (R) are False.

Assertion: Trained athletes have an increased proportion of energy derived from aerobic respiration of fatty acids.
Reason: Any adaptation that spares muscle glycogen will improve physical endurance.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

Assertion: Animals that are aquatic rather than terrestrial can support relatively larger exoskeletons.
Reason: The terrestrial organisms are relatively larger than aquatic animals.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

Assertion: Vertebral foramen is not seen in sacrum and coccyx.
Reason: They are fused and also the spinal cord ends at the lumbar region.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

Assertion: The first seven rib pairs known as the fixed or vertebrosternal ribs are the true ribs.
Reason: Only the first seven rib pairs are made up of bone while others are made of cartilage.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

Assertion: In the human body, an example of a second-class lever is found in the lower leg when someone stands on tiptoes.
Reason: The axis is formed by the metatarsophalangeal joints, the resistance is the weight of the body, and the force is applied to the calcaneus bone (heel) by the gastrocnemius and soleus muscles through the Achilles tendon.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

Assertion: Corticosteroids are used in management of rheumatoid arthritis.
Reason: Corticosteroids favor the formation of a new articular cartilage.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

Assertion: For moving on land, powerful muscles and strong skeletal support are more important than a streamlined shape.
Reason: Land animal must be able to support itself and move against gravity.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R): 

In the light of the above statements choose the correct answer from the options given below:

Sliding filament theory can be best explained as