29. The upper surfaces of leaves are used mainly for a. light gathering.
b. gas exchange.
c. collecting water.
d. protection from predators.
30. Which answer choice describes the direction in which sugars are most commonly transported by the vascular
system?
a. A to B only
b. A to C only
c. A to B and C
d. C to A and B
31. Seed plants whose seeds are not enclosed in fruit are
a. gymnosperms.
b. angiosperms.
c. ferns.
d. flowering plants.
32. If a cell contains a nucleus and membrane-bound organelles, it is
a. multicellular.
b. heterotrophic.
c. an animal cell.
d. eukaryotic.
33. An animal is each of the following EXCEPT
a. multicellular.
b. autotrophic.
c. heterotrophic.
d. eukaryotic.
34. A student looks at a slice of tissue on an unlabeled microscope slide. The student concludes the tissue is not
from an animal because the cells in the tissue have
a. membrane-bound organelles.
b. nuclei.
c. cell membranes.
d. cell walls.
35. Which of the following are characteristics of amphibians?
a. Hair or fur c. Moist skin, lack scales
b. Hollow bones, strong muscles d. dry, scaly skin
36. This group of worms include earthworms, which are decomposers.
a. Porifera c. Roundworms
b. Flatworms d. Segmented Worms