Question

The outermost layer of the leaf is the epidermis; it is present on both sides of the leaf and is called the upper and lower epidermis, respectively. botanists call the upper side the adaxial surface (or adaxis) and the lower side this?

Answer 1

abaxial surface  or abaxis 

Leaf Structure and Function The outermost layer of the leaf is the epidermis; it is present on both sides of the leaf and is called the upper and lower epidermis, respectively. Botanists call the upper side the adaxial surface  or adaxis  and the lower side the abaxial surface  or abaxis . The epidermis helps in the regulation of gas exchange. It contains stomata  Figure 30.24 : openings through which the exchange of gases takes place. Two guard cells surround each stoma, regulating its opening and closing.