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Stomata: Opening and Closing

Subsidiary ce...

Question

Subsidiary cells differ from guard cells in

A

Being parenchymatous

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B

Lacking mitochondria

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C

Lacking chloroplasts

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D

Lacking vacuole

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Solution

The correct option is C Lacking chloroplasts

Two or four subsidiary cells are found surrounding the pair of guard cells. Subsidiary cells do not consist of chloroplasts. They provide support for the functioning of guard cells in the epidermis.
So the correct option is ' lacking chloroplasts'.

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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

Stomata which remain surrounded by a pair of subsidiary cells whose common wall is at right angles to guard cells are called

Guard cells differ from epidermal cells in having

What are the two factors stomata depends upon to open and close guard and subsidiary cells alternately?

Q. Observe the structure of stomata from A to H during transpiration and match appropriately.
1. Stomatal pore
2. Accessory cells
3. Outer thin cell wall
4. Guard cells lose water by exosmosis and stomata close
5. Guard cells (kidney shaped)
6. The guard cells take in water by osmosis as indicated by arrows and stomata open
7. Inner thick cell wall
8. Vacuole

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