Select the incorrect sentence.

Find out the reason behind the following statements:
$(a)$ Epidermis is thicker in desert plants,though it is usually single-layered.
$(b)$ Presence of a waxy layer (secreted by the epidermis) on the outer surface of plants.
$(c)$ Meristematic cells have a prominent nucleus and dense cytoplasm but lack a vacuole.

Which of the following tissues has dead cells?

The dividing cells at the tip of root and stem are known as?

Name the tissue which is present in the veins of leaves.

What is the chemical substance that makes the cells of the sclerenchyma hard? Mention where this tissue is likely to be present.