When a plant is flooded it often increases its
cytokines
ethylene
gibberellins
all of the above
Specific ions are acquired by root hairs by the process of
simple diffusion
osmosis
facilitated diffusion
About _______________ % of the water taken in by roots is lost by transpiration.
100
A common adaptation of plants to an aquatic existence is the formation of
chlorenchyma
aerenchyma
collenchyma
sclerenchyma
In the absence of transpiration water moves into and up the xylem because of
root pressure
turgor pressure
evaporation
high soil mineral concentration
The reason that a column of water in a tall tree does not sink because of its weight is
the formation of hydrogen bonds with the plants vessels
bubbles form that are too large to be transported
the presence of strong ion concentrations near the top of the tree
The blood also carries _________ which are fragments of cells.
Blood
Platelets
Plasma
None
Scientists take advantage of _______________ in studying translocation by phloem.
ants
aphids
bees
butterflies
Which of the following is a correct list of contents of the organic material in soil?
humus,roots and decomposed material
roots and small animals
minerals, small animals, and roots
Guttation is:
movement of soluble organic materials through plants
movement of water through the apoplast.
evidence of root pressure.
negative pressure created by transpiration.
