Assertion : Pavlov has improtant contribution in study of digestion.
Reason : Pavlov discovered that salivation occurs when food is placed in front of us.

(a) Both assertion (A) and (R) are true and reason (R) is the correct explanation of assertion (A). (b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A). (c) Assertion (A) is true but reason (R) is false. (d) Assertion (A) is false but reason (R) is true Assertion (A) : Herbivores have larger small intestine as compared to carnivores. Rason (R) : Complete digestion of food takes places in small intestine.

Assertion : Whale has a thick layer of fat, called blubber, below its skin. Reason: It uses this fat as the source of energy when deep in water.

In these question, a statement of asertion followed by a statement of reason is given .Choose the correct answer out of the following choices: Assertion and reason both are correct statements and reason is correct explanation for assertion. Assertion and reason both are correct statements but reason is not correct explanation for assertion. Assertion is correct statement but reason is wrong statement. Assertion is wrong statement but reason is correct statement. Assertion:When a tiny circular obstacle is placed in th path of light from some distance,a bright spot is seen at the cente of the shadow of the ostacle. Reason:Destructive interference occurs at the centre of the shadow.

Assertion: Human population size has grown enormously over the last hundred years. Reason: Increasing population creates more demand for food, water, home, electricity, roads and automobiles that exerting tremendous pressure on our natural resources, and are also contributing to pollution of air, water and soil.

Read the assertion and reason carefully to mark the correct option out of the option given below: Assertion: Absorption of digested food mainly occurs in the stomach. Reason : Stomach produces the hormone gastrin and the intrisic factor and it liquifies ingested food.

Assertion (A): Digestion does not take place in large intestine. Reason (R): Undigested food gets converted to faeces in large intestine.

Assertion. Smoking increases secretion of gastric juice even when there is no food in the stomach. Reason. This is aimed at quickening the digestion of food when taken.

Assertion: A compass needle when placed on the magnetic north pole of the earth rotates in vertical direction. Reason: The earth has only horizontal component of its magnetic field at the north poles.

Assertion: A compass needle when placed on the magnetic north pole of the earth rotates in vertical direction. Reason: The earth has only horizontal component of its magnetic field at the north poles.