Contractile proteins are found in

What is the difference between sclerenchyma and collenchyma?

Note the relationship between the first pair of words and accordingly fill in the blank.
$(a)$ Salivary Gland : Glandular Epithelium : : Respiratory tract : . . . . . .
$(b)$ Flexibility : Collenchyma : : Hardness : . . . . . .
$(c)$ Cutin : Epidermis : : Suberin : . . . . . .
$(d)$ Plasma : Blood : : Axon : . . . . . .

Differentiate between voluntary and involuntary muscles. Give one example of each type.

Differentiate the following activities on the basis of voluntary $(V)$ or involuntary $(IV)$ muscles:
$(a)$ Jumping of a frog
$(b)$ Pumping of the heart
$(c)$ Writing with hand
$(d)$ Movement of food in your intestine

Write true $(T)$ or false $(F)$ for the following statements:
$(a)$ Epithelial tissue is a protective tissue in the animal body.
$(b)$ The lining of blood vessels,lung alveoli,and kidney tubules are all made up of epithelial tissue.
$(c)$ Epithelial cells have a lot of intercellular spaces.
$(d)$ The epithelial layer is a permeable layer.
$(e)$ The epithelial layer does not allow the regulation of materials between the body and the external environment.