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Byju's Answer
Standard XII
Biology
Stomata
Given figures...
Question

Given figures (P and Q) represent the stomatal apparatus of dicot and monocot leaves respectively. Select the option which correctly labels A,B and C

ABC
StomaSubsidiary cellsGuard cells
StomaSubsidary cellsEpidermal cells
Guard cellsStomaChloroplast
StomaGuard cellsSubsidiary cells

886136_03ef09f00b5b4a8e83b1e6c18be6f74c.jpg

A
A-Stoma , B -Subsidiary cells, C- Guard cells
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B
A- Stoma , B - Subsidary cells, Epidermal cells
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C
A- Guard cells ,B-Stoma ,C-Chloroplast
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D
A-Stoma ,B-Guard cells,C- Subsidiary cells
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Solution

The correct option is D A-Stoma ,B-Guard cells,C- Subsidiary cells
In the stomatal apparatus for Monocot and dicot plant,
A - represents the stomatal pore or the stoma
B-represents guard cells. kigney shaped and dumbel shaped respectively.
C-represent subsidiary cells - epidermal cells surrounding the guard cells, maintain turgor pressure of the guard cells.
So, the correct answer is 'A-Stoma ,B-Guard cells,C- Subsidiary cells'

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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?
ABCD
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 cellStomatal aperture Subsidiary cell

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Q.

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.


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 well stained leaf peel mount when observed under the high power of a microscope shows nuclei in :
(1) only epidermal cells
(2) only guard cells
(3) guard cells and epidermal cells
(4) guard cells, epidermal cells and stoma
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.
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