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Course: Cambridge AS & A Level Biology 9700 ...
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Cambridge AS & A Level Biology 9700 — Revision Notes

1 · Cell Structure

0/26

2 · Biological Molecules

0/51

3 · Enzymes

0/29

4 · Cell Membranes and Transport

0/41

5 · The Mitotic Cell Cycle

0/21

6 · Nucleic Acids and Protein Synthesis

0/22

7 · Transport in Plants

0/28

8 · Transport in Mammals

0/39

9 · Gas Exchange

0/13

10-11 · Infectious Disease and Immunity

0/43

12 · Energy and Respiration

0/37

13 · Photosynthesis

0/23

14-15 · Homeostasis and Control

0/57

16 · Inherited Change

0/34

17-18 · Selection, Evolution, Classification and Conservation

0/69

19 · Genetic Technology

0/44
Quiz

14.2.2 Guard Cells – Exam questions

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  • Questions count: 5
  • Passing grade: B+
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1.
Guard cells close stomata when
carbon dioxide is low
the plant is growing fast
the plant is short of water
light intensity is high and water is plentiful
2.

Stomata open when guard cells

become flaccid
become turgid
lose potassium ions
die
3.

During stomatal opening, proton pumps in guard cells

pump K⁺ out
pump water in directly
pump Cl⁻ out
pump H⁺ out, so that K⁺ ions enter through channels
4.

Guard cells differ from other epidermal cells in having

chloroplasts and unevenly thickened walls
no nucleus
no vacuole
lignified walls
5.

When water enters the guard cells, their water potential had been lowered by

accumulation of K⁺ ions
loss of solutes
loss of chloroplasts
ABA
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Part of 14-15 · Homeostasis and Control — see every lesson and quiz in this unit.
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