Assertion   :       Neurons are said to possess the property of excitability.

Reason      :       Neurons can get excited by a given stimulus.

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   :       Non-myelinated nerve fibres do not possess nodes of Ranvier.

Reason      :       This is due to the absence of nissl’s bodies in node of Ranvier.

Assertion   :       Extracellular materials help in separation of cells.

Reason      :       Cell junctions are formed by extra cellular materials.

Assertion   :       Epithelial tissues protect the under lying and over lying tissues.

Reason      :       Materials are exchanged at the surfaces across the epithelial tissues.

Assertion   :       The cells of columnar epithelium in absorptive surfaces often bears microvilli on their free ends.

Reason      :       Microvilli on their free ends.

Assertion   :       Ciliated epithelium helps in movement of particles.

Reason      :       Cilia help in movement.

Assertion   :       Fibroblasts help in protection.

Reason      :       Fibroblasts synthesize two kinds of protein which are protective in nature.

Assertion   :       Pinna of ear is elastic in nature.

Reason      :       Hyaline cartilage present in pinna.

Assertion   :       Lining of some hollow organs & cavities are moist.

Reason      :       This is because of the mucus secreted by the connective tissue.

Assertion   :       Extracellular materials are important for cells.

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