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Ch.32 Study Guide
Key Terms:
 Xylem
 Phloem
 Root hairs
 Extracellular route
 Intracellular route
 Casparian strip
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Transpiration
Root pressure
Guard cells
Nitrogen fixation
o Nitrogen fixing
bacteria
o Ammonifying
bacteria
o Nitrifying
bacteria
Multiple Choice:
1) Where do plants get most of their mass?
A) from nitrogen in the atmosphere
B) from carbon dioxide in the atmosphere
C) from water, as van Helmont predicted
D) from organic molecules taken up from the soil
2) What is the physical barrier in the root that regulates the flow of water to xylem via cell walls?
A) phloem
B) epidermis
C) Casparian strip
D) cortex
3) ________ increase the surface area of roots.
A) Plasmodesmata
B) Cell walls and endoplasmic reticulum
C) Casparian strips
D) Root hairs
4) The loss of water from the leaves of plants is
A) adhesion.
B) cohesion.
C) transpiration.
D) osmosis.
5) The pores that facilitate gas exchange in plant leaves are called
A) stomata.
B) guard cells.
C) lenticels.
D) plasmodesmata.
6) If a plant is kept in the dark,
A) the stomata continue their daily rhythm of opening and closing.
B) the stomata will remain closed the entire time that the plant is in the dark.
C) the stomata will remain open the entire time that the plant is in the dark.
D) the guard cells will open as water is added.
7) Most plants can absorb and use which of the following forms of nitrogen directly?
A) nitrite and nitrate
B) nitrate only
C) ammonium and nitrogen gas
D) nitrate and ammonium