A plant secretes __________ when it needs to
respond defensively to a pathogen.
a. salicylic acid
b. systemin
c. brassinosteroids
d. mineralocorticoids
e. nitric oxide
Answer: a
You might also like to view...
Food chains are sometimes short because _____
A) only a single species of herbivore feeds on each plant species B) local extinction of a species causes extinction of the other species in its food chain C) most of the energy in a trophic level is lost as it passes to the next higher level D) predator species tend to be less diverse and less abundant than prey species E) most producers are inedible
A first aid for stingray injury is:
a. place the injured area in cold water or apply ice packs. b. pour ammonia over the injured area. c. place the injured area in hot water. d. apply MSG to the injured area. e. urinate onto the wound.
Plants deter herbivores by producing compounds that are not necessary for the metabolism of the plant. These compounds are manufactured purely to prevent being eaten
a. secondary compounds b. primary compounds c. resins d. tertiary compounds e. waxes
X-ray crystallography showed that DNA:a
had the bases in the center of the molecule. b. had the sugars and phosphates on the outside of the molecule. c. was a very long molecule. d. was made of 2 strands. e. was a helix.