Which of the following helps in the repair of tissue and fills up the space inside the organ?

$(a)$ Name the animal tissue which is present in the larynx.
$(b)$ Write the chemical constituents of this tissue.
$(c)$ What functions does this tissue perform?

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.

If the tip of a sugarcane plant is removed from the field,it still continues to grow in length. This is due to the presence of:

Name the muscular tissue which is present in the iris of the eye. What is the shape of these cells?

$(a)$ Differentiate between meristematic and permanent tissues in plants.
$(b)$ Define the process of differentiation.
$(c)$ Name any two simple and two complex permanent tissues in plants.