Problem :
What are the three major functions of plant roots?
Nutrient storage, water and mineral uptake (from soil), and stability (anchorage
to substrate).
Problem :
Describe taproots, fibrous roots, and adventitious roots. How are
they different?
A taproot, characteristic of dicots, is a single dominant root from which
smaller, secondary roots extend. Fibrous roots, a system composed of many small
roots, have no single dominant root. Taproots stretch deep into the soil, while
fibrous roots spread out close to the surface. Adventitious roots develop on
vines after embryonic development and help plants cling to substrates other than
the soil, such as a tree trunks.
Problem :
What is meant by the "root" and the "shoot" of a plant?
All parts of the plant that lie beneath the soil are considered the "root" and
all the parts above the soil (stem, leaves, flowers, etc.) are known as the
"shoot."
Problem :
What purpose do root hairs serve? Why are roots alone not sufficient to
accomplish that task?
Root hairs absorb most of the water and minerals taken in by the plant. They
are necessary because the huge number of tiny root hairs produce a very large
total absorptive surface area, so that root hairs allow the plant to take in
much larger quantities that the root alone could bring in.
Problem :
What vascular tissue is responsible for passing the water and minerals taken
in by the roots upward to the rest of the plant body?
Xylem.
