Flexibility in plants is due to

Cork cells are made impervious to water and gases by the presence of

Explain the basic characteristics for the classification of permanent tissues in plants.

If the tip of a sugarcane plant is removed from the field,it still continues to grow in length. This is due to the presence of:

Write two basic structural differences between parenchyma and collenchyma tissues.

Give short answers:
$(i)$ What is the function of cambium?
$(ii)$ What is meant by lignin? Where is it present?
$(iii)$ What are the characteristics of cells of epidermis?