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

Name the animal tissue which acts as a heat insulator.

Name the meristem which is responsible for the increase of girth of root.

Write any one characteristic of meristematic tissue.

$(a)$ Why are complex tissues called so?
$(b)$ Why is connective tissue called so?
$(c)$ What is the function of the tissue present in the lining of kidney tubules?

$(i)$ Draw a diagram of the epidermis of a leaf showing the surface view and label the stomata,guard cells,and epidermal cells.
$(ii)$ Answer the following:
$(a)$ How is the epidermis of plants living in very dry habitats adapted?
$(b)$ Write the functions of guard cells of stomata in the leaf.