Draw a neat diagram of the stomatal apparatus found in the epidermis of leaves and label the Stoma, Guard cells, Chloroplast, Epidermal cells, Cell wall and the Nucleus.

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Q. Given below is the diagram of a stomatal apparatus. In which of the following, all the four parts labelled as A, B, C and D are correctly identified?

	A	B	C	D
1.	Epidermal cell	Subsidiary cell	Stomatal aperture	Guard cell
2.	Subsidiary cell	Epidermal cell	Guard cell	Stomatal aperture
3.	Guard cell	Stomatal aperture	Subsidiary cell	Epidermal cell
4.	Epidermal cell	Guard cell	Stomatal aperture	Subsidiary cell

Q. In the sketch of stomatal apparatus given alongside, the parts I, II, III and IV were labelled differently by four students. The correct labelling is shown in :

(1) (I) guard cells, (II) stoma, (III) starch granule, (IV) nucleus
(2) (I) cytoplasm, (II) nucleus, (III) stoma, (IV) chloroplast
(3) (I) guard cells, (II) starch, (III) nucleus, (IV) stoma
(4) (I) cytoplasm, (II) chloroplast, (III) stoma, (IV) nucleus

Q. A student had drawn the diagram of stomata in a hurry, as shown alongside. He could not be given full marks as he :

(1) forgot to draw nuclei in guard cells and also to label the diagram.
(2) did not draw nuclei in guard cells and other cells.
(3) should have drawn nuclei and chloroplasts in guard cells and nuclei in all epidermal cells.
(4) did not label the stoma in the correct position.

Q.
The stomatal pore is guarded by two kidney shaped guard cells. Name the epidermal cells surrounding the guard cells. How does a guard cell differ from an epidermal cell? Use a diagram to illustrate your answer.

Q. The number of stomata and epidermal cells in 1 $m m^{2}$ leaf area in the lower epidermis of the leaves of X, Y and Z plants is given below. Arrange the plants in decreasing order of their stomatal index.
cells
Number of Stomata
Number of epidermal cells
X
30
150
Y
60
240
Z
90
400

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The Leaf and Its Parts
Standard XII Biology

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cells	Number of Stomata	Number of epidermal cells
X	30	150
Y	60	240
Z	90	400