A leaf is comprised of the upper epidermis, palisade mesophyll cells, spongy mesophyll cells, and the lower epidermis. The lower epidermis contains many minute pores for gaseous exchange called stomata. Both the upper and the lower epidermis are covered with a waxy coating cuticle that helps in reducing water loss through leaves.

After completing this module, you will be able to:

- Identify the shape and location of various cell types that constitute a leaf.

- Recognize the different layers of a leaf.

- Construct a section of a leaf.

- Label the different layers and cells of a leaf.