Problem :
Describe the two types of vascular tissue that are found in tracheophytes.
The two kinds of vascular tissue in tracheophytes are called xylem and
phloem. The xylem of vascular plants consists of dead cells placed end to
end that form tunnels through which water and minerals move upward from the
roots (where they are taken in) to the rest of the plant. Phloem, which is made
up of living cells, carries the products of photosynthesis (organic
nutrients) from the leaves to the other parts.
Problem :
What does "TATC" stand for, and what is its presumed function?
TATC stands for transpiration-adhesion-tension-cohesion, which is the mechanism
that scientists think pulls fluid upward from the roots through the xylem.
Problem :
In plants, water potential is responsible for moving fluids from one cell to
another. What are the two components of water potential?
The two components of water potential are 1) the differences in osmotic
concentration (concentration of solute) between two regions and 2) the
differences in water pressure (created because of the rigidity of plant cell
walls).
Problem :
Name and describe the two mechanisms by which water can move from the root
surface to the xylem at the core.
One pathway for water is the symplast, in which water moves across the
root hair membrane and through the cells themselves, via channels that
connect their contents. With the apoplast pathway, on the other hand, water
travels along cell walls and through intercellular spaces (instead of through
the cytoplasm of neighboring cells).
Problem :
What happens to water in the vascular system once it reaches the leaf?
The water either evaporations through the stomata of the leaf
(transpiration) or is passed into the phloem along a water potential gradient.
