Chose a b c or d
21. Pollen grains are produced by
a.male reproductive structures.
b. flowers.
c. female reproductive structures. d. ovules.
22. Which of the following is the only tissue that produces new plant cells?
a. phloem
b. ground tissue
c. xylem
d. meristematic tissue
23.A period of dormancy can allow seeds to germinate
a. under poor conditions.
b. without water.
c. under ideal conditions.
d. in extreme
temperatures.
24.What might a thin tree ring indicate?
a. decreased production of phloem
b. xylem production in winter
c. a year of drought
d. increased production of xylem
25. Cytokinins differ from auxins in that cytokinins
a. cause seeds to remain dormant.
b. inhibit lateral bud growth.
c. cause leaves to fall.
d. inhibit elongation of cells
26. Minerals from the soil move into roots by
a. transpiration.
b. root pressure.
c. active transport.
d. diffusion.
27. The first plants evolved from
a. mosses.
b. photosynthetic prokaryotes.
c. a protist that lived on land
. d. an organism
similar to multicellular green algae.
28. In angiosperms, reproduction takes place in
a. flowers.
b. cones.
c. leaves.
d. pollen.
29. A plant is a(an)
a. multicellular prokaryote
. b. unicellular prokaryote.
c. unicellular eukaryote.
d. multicellular eukaryote.
31.
The tough outer layer of a seed is called the
a. nut.
b. seed coat.
c. fruit. d. embryo wall.
32. Plants can respond to changing environmental conditions by the use of which chemicals?
a. hormones
b. enzymes
c. pigments d. sugars
33. A seed that is dispersed to an area far away from the parent plant might face less
a. germination.
b. alternation.
c. pollination.
d. competition.
34. Hormones that stimulate cell elongation and are produced in the rapidly growing region near
of the plant's root or stem are called
a. cytokinins.
b. ethylenes.
c. auxins.
d. gibberellins.
35.Which of the following is NOT a characteristic of all plants?
a. produce seeds
b. are eukaryotic
c. have cell walls
d. are multicellular
36. Seeds dispersed by animals typically are contained in
a. thin coatings that are easily digested.
b. fleshy, nutritious fruits.
c. lightweight structure
d. unripened ovaries
