Determine whether each statement is true (T) or false (F). Place your answer in the
blank space given.
a. F. W. Went isolated the chemical substance responsible for
communicating stimulus information.
b. The chemical substance responsible for communicating stimulus
information is a hormone.
c. Charles and Francis Darwin confirmed that the tip of a plant stem is
responsible for initiating the phototropic response.
d. When the tip of a stem is covered with a transparent cap, the stem bends
toward the light source anyway.
e. When the base of a stem is covered with an opaque shield, the stem
bends away from the light source.
f. An example of another control mechanism is that some plants require
more than 12 hours of darkness to produce flowers.

Recently, crops of vegetables such as lettuce and green onions have been contaminated, while they are still on the farm, with bacteria that cause food poisoning. how will science influence the way the government responds to prevent an increase in food-borne diseases? because science has shown that lettuce and green onions are not nutritionally valuable, the government may pass laws that ban the sale of lettuce and green onions. because science has shown that there is no way to prevent bacterial contamination, the government may pass laws that punish businesses that buy lettuce and green onions. because science has shown that the washing of hands prevent the spread of infectious diseases among people, the government may pass laws that require hand washing by everyone who handles food. because science has shown there are ways to find the source of the contamination, the government may pass laws that require farm practices that reduce the contamination of lettuce and green onions.