Assertion   :       Columnar epithelium lining the intestinal mucosa appears to have a brush like appearance.

Reason      :       A large number of microvilli are present on brush bordered columnar epithelium.

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

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

Assertion   :       Mast cells help in body defence.

Reason      :       Mast cells phagocytose & destroy microbes.

Assertion   :       Surface of skin is impervious to water.

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

Assertion   :       Bones possess longitudinal canals called lacunae.

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

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

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

Assertion             :       Specialization of cells is advantageous for the organism.

Reason                :       It increase the operational efficiency of an organism.

Assertion   :       Histamine is related with allergic and inflammatory reactions.

Reason      :       Histamine is a vasodilator.

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.

Embryologically, the body of cockroach is formed of 20 segments. What is the number in each region?

1. Head - 6; Thoracic - 3; Abdominal - 11

2. Head - 1; Thoracic - 3; Abdominal - 10

3. Head - 3; Thoracic - 3; Abdominal - 11

4. Head - 0; Thoracic - 3; Abdominal – 10