Assertion   :       Extracellular materials are important for cells.

Reason      :       Intercellular materials surround the cells & bind them together.

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   :       Simple epithelium covers surfaces exposed to mechanical or chemical abrasions.

Reason      :       Protection of underlying tissues is the major function of simple epithelium.

Assertion   :       Materials are exchanged between epithelial & connective tissue by diffusion.

Reason      :       Blood vessels are absent in epithelial tissue.

Assertion   :       Urinary bladder can considerably expand to accommodate urine.

Reason      :       It is lined by stretchable squamous epithelium.

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.

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.