5 Written Questions

1. The tendency of a plant to grow toward a source of light.
2. The responses of plants to external stimuli.
3. A meristematic area on the side of a stem that gives rise to side branches. Their growth can be inhibited by auxins.
4. Compounds which produce dramatic increases in size, particularly in stems and fruit.
5. 2 types if plants that have specialized features for obtaining nutrients.

5 Matching Questions

1. Cytokinins
2. Insects
3. Meristems
4. Abscission Layer
5. Gravitropism

1. a The response of a plant to the force of gravity.
2. b A layer of cells at the petiole which seals the leaf off from the plant's vascular system.
3. c Many plants defend themselves against ______ by manufacturing compounds that have powerful effects on animals.
4. d Plant hormones that stimulate cell division and the growth of lateral buds or cause dormant seeds to sprout. They often produce opposite effects to those of auxins, by inhibiting cell elongation and causing cells to grow thicker. They are produced in growing roots and in developing roots and seeds.
5. e Regions of tissue which can produce cells that later develop into specialized tissues.

5 Multiple Choice Questions

1. Plants that are not rooted in the soil but grow directly on the bodies of other plants but are not parasites. They gather their own moisture and produce their own food. (Ex: Moss or Orchids)
   1. Epiphytes
   2. Meristems
   3. Ethylene
   4. Xerophytes
2. A plant hormone which causes fruit to ripen. It is also a minor component of natural gas.In response to auxins, fruit tissues release small amounts of it.
   1. Hormone
   2. Epiphytes
   3. Ethylene
   4. Xerophytes
3. Compounds which are toxic to plants and mimic the effects of auxins.
   1. Hormone
   2. Herbicides
   3. Xerophytes
   4. Meristems
4. The phenomenon in which because auxins move out from the apical meristem, the closer a lateral bud is to the meristem, the more its growth is inhibited.
   1. Apical dominance
   2. Dormancy
   3. Cytokinins
   4. Aquatic Plant
5. The period during which an organism's growth and activity decrease or stop. When it starts getting cold, deciduous plants turn off photosynthetic pathways, transport materials from leaves to roots, and seal leaves off from the rest of the plant.
   1. Hormone
   2. Dormancy
   3. Ethylene
   4. Auxins

5 True/False Questions

1. Salt-tolerant plants → Plants that flower when days are short.

   True        False

2. Photoperiodism → The tendency of a plant to grow toward a source of light.

   True        False

3. Thigmotropism → The response of plants to touch. One effect is that plants curl and twist around objects.

   True        False

4. Phytochrome → The tendency of a plant to grow toward a source of light.

   True        False

5. Long-day plants → Plants that flower when days are short.

   True        False