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

What is the difference between sclerenchyma and collenchyma?

What is the difference between simple permanent tissue and complex permanent tissue?

State whether the following statement is true or false:
The brain,spinal cord,and nerves are all composed of muscular tissue.

Nervous tissue is not found in

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.