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Byju's Answer
Standard XII
Biology
Stomata: Opening and Closing
In the sketch...
Question

In the sketch of the stomatal apparatus given alongside, which one of the following is missing?


(1) Cell membranes of the cells
(2) Cell walls of the cells
(3) Nuclei in the guard cells
(4) Chloroplasts in the guard cells

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Solution

The nuclei in the guard cells is missing from the sketch of the stomatal apparatus given above.

Hence, the correct answer is option 3.

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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 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. Select the correct events leading to the stomatal opening.
(a) The decline in guard cell solutes.
(b) Lowering of osmotic potential of guard cells.
(c) Rise in K ions in guard cells.
(d) Movement of water from neighboring cells into guard cells.
(e) Guard cells become flaccid.
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Standard XII Biology
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