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Standard XII
Biology
Question

Specialized epidermal cells surrounding the guard cells are called as
  1. Complementary cells.
  2. Lenticels.
  3. Bulliform cells.
  4. Subsidiary cells.

A
Complementary cells.
B
Bulliform cells.
C
Subsidiary cells.
D
Lenticels.
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Solution
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Stomata are minute pores which occur on the epidermal surface of leaves and also some herbaceous stems. Each stoma is guarded by two specialised cells, called guard cells. These guard cells are also surrounded by other specialised epidermal cells called subsidiary cells. These cells also play an important role in opening and closing of stomata.
So, the correct answer is option B.

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Specialized epidermal cells surrounding the guard cells are called:
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Q2
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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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.

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Q5
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