Animations
Movies
Words
Appendix
Summary
Art
Art
Chapter
37
Quizzes:
Self
Activities
Chapter
Cum.
Unit 6: Plant Form and Function
Plant Nutrition
Review
The branching
system and
system of
plants
obtain the
nutrients of water, minerals, and
dioxide from the
environment.
These molecules are
made
of
.
Nine of the
elements
are called
since they are required in relatively large
amounts;
the remaining eight are known as
, needed in small amounts mainly as
of enzymes.
Soil is composed of weathered
of various sizes, along with decaying organic material called
, arranged in vertical
layers
called
.
Soil particles are usually
, and the film of water bound to soil is inaccessible to plants. Clay soils are
and also bind
charged minerals. Those minerals are made available to plants by
exchange
when plants release CO
2
into the soil as a product of cellular
.
Review:
How Plants Obtain Minerals from Soil
Nitrogen-
Rhizobium
bacteria , in symbiosis with
plants, convert inorganic N
2
in the atmosphere to nitrogenous minerals such as
and
that plants can
absorb.
Most plants also form
, a symbiotic association of fungi and roots which can be two types.
In
, the mycelium of the fungus forms a dense sheath over the
surface
of the root.
In
, fungal hyphae extend
into
the root, forming
arbuscules.
Unusual nutritional adaptations in plants include:
can nourish themselves, but grow on another plant. They absorb water and minerals from rain, mostly through
rather than
roots.
plants absorb sugars and minerals from their living hosts. Many species have roots that function as
, nutrient-sbsorbing projections that enter the host
plant.
plants are photosynthetic but obtain some
and other minerals by
digesting
small
animals.
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Oct 7, 2006
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