In Figure 33-1, the region that is composed of secondary xylem is:
a. 1.
b. 2.
c. 3.
d. 4.
e. 5.
C
You might also like to view...
Athlete's foot is an example of a
A) protozoal infection. B) superficial fungal infection. C) superficial parasitic infection. D) hypersensitivity reaction.
Which of the following statements about steroid hormones in insects and humans is most accurate?
a. An insect hormone injected into a human would have no effect. b. A human hormone injected in an insect would have no effect. c. The reaction pathways stimulated by steroid hormones in insects and humans are similar. d. The reaction pathways stimulated by steroid hormones in insects and humans are different. e. Insects do not have steroid hormones.
Which of the following is not a function of a plant stem?
A. storage of starch B. storage of water C. production of pollen D. support E. protection from predators
Which of the following is/are means whereby a catalyst can lower the activation energy of a reaction?
A) decreasing the number of reactive molecules B) altering the temperature within the cell to one appropriate for reactions to proceed C) quantum tunneling D) inefficient collisions E) permanently binding substrates