SUBJECTIVE SCORE
INSTRUCTOR USE
c905 с803
)=
c403
c3г
n
п
c 83
E 3
25. Even before a flower bud opens, certain plant chemicals have colored the flower in patterns particularly attractive to specific insects. At the same time, these chemicals protect the plant's reproductive structures by killing or inhibiting pathogens and insects that may feed on the plant.
Which statement about the plant and the other organisms mentioned is correct?
A. Chemicals affect plants but not animals.
B. Organisms of every niche may be preyed on by herbivores.
C. Any chemical produced in a plant can protect against insects.
D. Organisms may interact with other organisms in both positive and negative ways.
27.