Question

Choose the correct combination of labeling of stomatal apparatus of dicot and monocot leaves.

(a) a- epidermal cells, b- subsidiary cells, c- chloroplast, d- guard cells, e- stomatal aperture
(b) a- epidermal cells, b- guard cells, c- chloroplast, d- subsidiary cells, e- stomatal aperture
(c) a- epidermal cells, b- subsidiary cells, c- chloroplast, d- stomatal aperture, e- guard cells
(d) a- subsidiary cells, b- epidermal cells, c- chloroplast, d- stomatal aperture, e- guard cells
(e) a- guard cells, b- epidermal cells, c- stomatal aperture, d- subsidiary cells, e- chloroplast

Answer 1

These are tiny pores or openings present in the plant leaves and in the stem also that are responsible for gaseous exchange. It plays a very important role during the process of photosynthesis and transpiration.

Complete answer:
The correct combination of labeling of stomatal apparatus of dicot and monocot leaves in the given diagram is as follows from a to e is epidermal cells, subsidiary cells, chloroplast, guard cells, and stomatal aperture. In monocot and dicot plants the stomata are present in their leaves as well as in their stem. The stomata consist of the paired guard cells and the pore itself, which is referred to as the stomatal aperture. Through these openings, the air enters the plant by gaseous diffusion, containing carbon dioxide which is used in the process of photosynthesis.

Additional Information:
-Epidermal cells: These are Kidney shaped cells with an opening in the center known as the pore.
-Subsidiary cells: These cells surround the guard cells providing them mechanical support and also facilitates movements of guard cells, and acts as a reservoir for water and ions.
-Chloroplast: These are usually found in the guard cells. The chloroplast converts light energy into relatively stable chemical energy through the process of photosynthesis.
-Guard cells: These are found in pair made up of parenchyma cells and are responsible for regulating the size of the opening of stomata to prevent excessive water loss.,
-Stomatal aperture: collectively refers to the entire stomatal complex which consists of the paired guard cells and the pore itself. Air enters the plant through these openings by gaseous diffusion, containing carbon dioxide which is used in photosynthesis.

So, the correct answer is, ‘a- epidermal cells, b- subsidiary cells, c- chloroplast, d- guard cells, e- stomatal aperture’.

Note:
-The main characteristic feature that differentiates a monocot and a dicot leaf is that the guard cells of stomata are kidney-shaped in dicot leaf and dumb-bell-shaped in a monocot leaf.
-In a monocot leaf an equal number of stomata is present on both surfaces of the epidermis. This condition is normally described as an Amphi stomatic condition.
-In a dicot leaf stomata are usually present on the lower surface of the leaf, a condition referred to as hypostomatic.
-The vascular bundle is large in a dicot leaf, while both small and large vascular bundles are present in a monocot leaf.