Which of the following tissues has dead cells?

Identify the simple permanent plant tissue with the following descriptions and also mention their location in the plant body:
$(a)$ Cells have irregular wall thickenings.
$(b)$ Tissues with large intercellular spaces and cells having large air cavity.
$(c)$ Cells are long,narrow,and dead in nature.

Name the tissue which:
$(i)$ allows aquatic plants to float.
$(ii)$ provides flexibility to plants.

Differentiate between bone and cartilage with respect to structure,function and location.

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

State whether the following statement is true or false:
Epithelium covers most organs and cavities within the body.