Contractile proteins are found in

Voluntary muscles are found in

How will you classify permanent tissues in plants?

Give one reason for the following statements:
$(a)$ Blood is called a connective tissue.
$(b)$ Muscles are able to contract and relax to bring about movements.
$(c)$ Muscles of the heart are called involuntary muscles.

State one important function of each of the following:
$(a)$ Areolar tissue
$(b)$ Cuboidal epithelium

Explain the significance of the following:
$(a)$ Hair-like structures on epidermal cells
$(b)$ Epidermis has a thick waxy coating of cutin in desert plants
$(c)$ Small pores in the epidermis of a leaf
$(d)$ Numerous layers of epidermis in cactus
$(e)$ Presence of a chemical suberin in cork cells.