Question

After observing a temporary mount of leaf peel a student draws the following sketch of
stomatal apparatus and numbers the parts to label them
The chloroplast is denoted by

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

The correct option is D 4

The leaf peel is a thin transparent layer which forms the epidermis layer. The leaf peel possesses stomata which allow the exchange of gases in the leaves. The stoma or pores are surrounded by the epidermal cells which take kidney shape structures called guard cells. The wall of the guard cell close to the pore is thicker as compared to the wall away from the pore. The increase turgor pressure pulls the outer wall which causes opening of the stomata and thus thick wall is important for opening of the stomata.

The above figure clearly indicates the various parts of the complex structure of the stomatal apparatus structure. So, the correct answer is option 4 which denotes chloroplast.