4. Perception of gravity in plants involves: a) the sedimentation of the hormone

ID: 262248 • Letter: 4

Question

4. Perception of gravity in plants involves:

a) the sedimentation of the hormone IAA

b) the sedimentation of statoliths (amyloplasts)

c) sensitive root hairs located at tip of the root directs the growth of roots

d) gravity can not be perceived by plants

5. Which of the following statements concerning gravitropism

is not true.

a) Roots show positive gravitropism response.

b) Shoots of a plant grow laterally because of a gravitropism response.

c) Cells detect gravity because of starch grains (statoliths) sink to the

bottom of the cells.

d) A germinating seed placed 2 inches under the soil will

grow upward searching for sunlight.

6. Which of the following statements concerning the effect of ethylene gas

is not true.

a) Exposing this gas to bananas will enhance fruit ripening..

b) Exposing this gas to leaves will cause them to undergo abscission..

c) Exposing this gas to apical meristem will stimulate mitosis.

d) Short days causes leaves to produce ethylene gas which inhibits auxin production.

4. b) the sedimentation of statoliths (amyloplasts)

5. d) A germinating seed placed 2 inches under the soil will grow upward searching for sunlight.

6. c) Exposing this gas to apical meristem will stimulate mitosis.

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