Download الشريحة 1

4th Year(Special Botany Students)
Questions
* Where are auxins produced by the
plant? How are they transported?
* What effect do auxins have on shoot
growth?
* Can auxins inhibit root growth? Can
they promote root growth? How can
auxin be responsible for both?
* Your book says that auxins promote
growth rather than control it; explain
the difference.
* What uses do auxin sprays have for fruit
growers? for control of weeds?
* In what organism(s) were gibberellins
first discovered?
* What effect does gibberellin have on
shoot growth? on root growth? Which
group of plants are most sensitive to
gibberellins?
* How are gibberellins used in grape
production? in celery production? in
brewing?
* What kind of biomolecule is cytokinin?
* What effect do cytokinins have on plant
cells? on animal cells?
* In what plants and tissues were
cytokinins discovered? In which tissues
are they most commonly produced?
* Why is ABA called a "growth-inhibitting
hormone"? How is such a hormone
useful?
* In what tissues or structures does
ABA usually function?
* How does ABA make it easier to
ship plants?
* Which plant hormone is a gas?
* What effect does ethylene have on
flowers, leaves, and fruits? How is
ethylene useful to fruit growers?
* From where do plants get most of their
nitrogen? In what form?
* If there is so much nitrogen in the air,
then why don't plants make use of it?
* How does atmospheric nitrogen enter
the nitrogen cycle? What organisms are
responsible?
* What are some ways in which nitrogen
is returned to the atmosphere?
* How is decay important to the
nitrogen cycle?
* What is a biome?
* How much of the earth's surface is
tundra? Where is tundra found in
North America?
* Describe the climate of the tundra.
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What is the permafrost? Where is
it found? What is its effect on
tundra vegetation?
What is taiga? What are some
other names for the taiga? Where
is taiga found in North America?
Describe the climate and
vegetation of the taiga.
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Describe the climate and vegetation of a
temperate deciduous forest. Where can
such forests be found in North America?
How has European immigration affected
the deciduous forests of North America?
When do most flowers of the deciduous
forest bloom? Why?
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Describe the climate and
vegetation of a grassland. Where
are they found in North America?
Describe the climate and
vegetation of a desert. Where are
deserts found in North America?
What adaptations do desert plants
have for surviving there?
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What percent of earth's forest are
tropical rain forests? Describe the
climate of these forests.
What are epiphytes, and how do
they survive in tropical rain
forests?