Chapter 39 Review: Plant Responses to Internal and External Signals

Auxin is a plant hormone involved in
1. apical dominance. <==== correct
2. axillary dominance. (wrong)
3. de-etiolation. (wrong)
4. etiolation (wrong)
5. double fertilization. (wrong)
  Hint
Cytokinins are produced primarily in ________ of plants.
1. axillary buds (wrong)
2. apical buds (wrong)
3. cotyledons (wrong)
4. leaves (wrong)
5. roots <==== correct
  Hint
Auxin works by
1. lowering the pH in the cell wall. <==== correct
2. increasing the pH in the cell wall. (wrong)
3. lowering the pH in the nucleus. (wrong)
4. increasing the pH in the nucleus. (wrong)
5. lowering the pH in the chloroplast. (wrong)
  Hint
A potato growing in the dark exhibits morphological adaptations called
1. germination. (wrong)
2. etiolation. <==== correct
3. phototropism. (wrong)
4. phototaxis. (wrong)
5. photophobia. (wrong)
  Hint
Gibberellin can promote which characteristic in plants?
1. faster germination (wrong)
2. deeper roots (wrong)
3. larger fruits <==== correct
4. taller plants (wrong)
5. bushier side branching (wrong)
  Hint
Which hormone can promote larger fruits in plants?
1. cytokinins (wrong)
2. gibberellin <==== correct
3. auxin (wrong)
4. ethylene (wrong)
5. insulin (wrong)
  Hint
Roots exhibit
1. negative gravitropism. (wrong)
2. positive gravitropism. <==== correct
3. negative phototropism. (wrong)
4. positive phototropism. (wrong)
5. inaction potentials. (wrong)
  Hint
Phototropism in a plant is accomplished when a stem bends toward the stimulus by
1. elongating the region of the stem away from the light. <==== correct
2. elongating the region of the stem toward the light. (wrong)
3. shortening the tip of the shoot. (wrong)
4. shortening the tip of the root. (wrong)
5. elongating the tip of the root. (wrong)
  Hint
The receptor in the de-etiolation ("greening") response in plants is
1. ATP. (wrong)
2. Ca²⁺. (wrong)
3. phytochrome. <==== correct
4. chlorophyll. (wrong)
5. cGMP. (wrong)
  Hint