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Discuss the adaptations that have enabled
flowering plants to overcome the
following problems associated with life on land.
a. The absence of an aquatic environment for
reproduction
b. The absence of an aquatic environment to support the
plant body
c. Dehydration of the plant
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Relate the structure of an angiosperm leaf
to each of the following.
a. Adaptations for photosynthesis and food
storage.
b. Adaptations for food translocation and
water transport.
c. Specialized adaptations to a desert
environment
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Trace the pathway in a flowering plant as
the water moves from the soil
through the tissues of the root, stem, and leaves to the
atmosphere. Explain
the mechanisms involved in conducting water through these
tissues.
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( This is a review question):
Trace the flow of energy from sunlight
through the photosynthetic autotrophs to heterotrophs. In your answer
include the following molecules: CO2 water, glucose, PGAL, ATP.
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Seeds that are randomly positioned when
planted in a pot of soil placed
on a window sill produce seedlings with downward growing roots
and
upward growing shoots. Above ground, the shoots are oriented
toward
light. Describe the physiological mechanisms that occur to
produce:
a) the downward growth of the roots
b) the upward growth of the shoots
c) the bending of the shoots toward light
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| Survival depends
on the ability of an organism to respond to changes in its
environment. Some plants flower in
response to changes in day length. Some
mammals may run or fight when
frightened. For both of these examples, describe the physiological
mechanism
involved in the response.
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