State whether the following statement is true or false:
An individual nerve cell may be up to a metre long.

Find out the reason behind the following statements:
$(a)$ Epidermis is thicker in desert plants,though it is usually single-layered.
$(b)$ Presence of a waxy layer (secreted by the epidermis) on the outer surface of plants.
$(c)$ Meristematic cells have a prominent nucleus and dense cytoplasm but lack a vacuole.

$(a)$ Voluntary muscles are also known as skeletal muscles. Justify.
$(b)$ Give two structural characteristics of these voluntary muscles.

While doing work and running,you move your organs like hands,legs etc. Which among the following is correct?

Mention the role of epidermis in the following:
$(a)$ In the aerial parts of the plant.
$(b)$ In leaves.
$(c)$ In roots.

Cartilage is not found in