Assertion   :       Histamine is related with allergic and inflammatory reactions.

Reason      :       Histamine is a vasodilator.

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   :       Mast cells in the human body release excessive amounts of inflammatory chemicals which cause allergic reactions.

Reason      :       Allergens in the environment on reaching human body stimulate mast cells in certain individuals.

In water, frogs respire through
(A)Skin
(B)lungs
(C)buccal cavity
(D)All of these

Assertion             :       Specialization of cells is advantageous for the organism.

Reason                :       It increase the operational efficiency of an organism.

Assertion   :     Cartilage (protein matrix) and bone (calcium matrix) are rigid connective tissue.

Reason      :     Blood is connective tissue in which plasma is the matrix.

Assertion   :       Bones possess longitudinal canals called lacunae.

Reason      :       Lacunae carry blood vessels & nerves to the bones.

Assertion   :       Surface of skin is impervious to water.

Reason      :       Surface of skin is covered by stratified cuboidal epithelium.

Assertion   :       Mast cells help in body defence.

Reason      :       Mast cells phagocytose & destroy microbes.

Assertion   :    Pseudostratified ciliated columnar epithelium is present in the inner lining of trachea.

Reason      :    Ciliary movements propel the mucus & foreign particles towards the larynx.