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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

14.2.1 Stomata – Exam questions

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  • Questions count: 14
  • Passing grade: B+
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1.
Which statement best describes Stomata?
Pores on leaves that allow gas exchange, controlled by guard cells.
Very fine tube of the insect tracheal system that delivers air directly to tissues.
Rate of diffusion is proportional to surface area x concentration difference / diffusion distance.
Tiny air sac in the lungs where gas exchange occurs.
2.
Plants use this process so that they can open their stomata at night and close them during the day to avoid water loss, without depleting CO2 reserves.
Plants use this process so that they can open their stomata at night and close them during the day to avoid water loss, without depleting CO2 reserves.
Transpiration
Calvin cycle
CAM photosynthesis
Cyclic photophosphorylation
Noncyclic photophosphorylation
3.
Stomata counts on leaf surfaces are shown. Which leaf surface loses most water, if other factors are equal?
Upper surface of leaf A
Upper surface of leaf B
Lower surface of leaf A
Lower surface of leaf B
4.
Which of the following is not a time when most stomata tend to be open?
Which of the following is not a time when most stomata tend to be open?
When CO2 concentrations are low inside the leaf
When temperatures are low
When the concentration of water inside the plant is low
During the day
On a cold, rainy day
5.
These cells are responsible for controlling the opening and closing of the stomata.
These cells are responsible for controlling the opening and closing of the stomata.
Sieve-tube elements
Vessel elements
Tracheids
Guard cells
Collenchyma cells
6.
These cells control the opening and closing of a plant\'s stomata:
These cells control the opening and closing of a plant's stomata:
Guard cells
Collenchyma cells
Parenchyma cells
Mesophyll cells
Sclerenchyma cells
7.
A newly discovered plant has an unusually low number of stomata on the undersides of its leaves. To which environment is it best adapted?
A newly discovered plant has an unusually low number of stomata on the undersides of its leaves. To which environment is it best adapted?
Cold and rainy
Humid and sunny
Hot and humid
Hot and dry
8.

Stomata

allow gas exchange in leaves
absorb light
transport water
make glucose
9.
Stomata on leaves allow
sugar transport
gas exchange and water vapour loss
root growth
water uptake from soil
10.
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
11.

Stomata generally open in the light in order to

lose water
take in oxygen for photosynthesis
cool the roots
allow carbon dioxide to diffuse in for photosynthesis
12.

Stomata show a daily rhythm of opening and closing which

depends only on temperature
never changes
occurs only in roots
continues for a time even in constant light or dark
13.

Closing stomata during water stress reduces

respiration to zero
transpiration
root growth
translocation
14.

Which change would cause stomata to close?

Bright light
High carbon dioxide concentration inside the leaf
Low CO₂ concentration in the leaf
High water availability
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Part of 14-15 · Homeostasis and Control — see every lesson and quiz in this unit.
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