Plant Regulation (College Bio)

What is growth that results in curvatures of whole plant organs toward or away from stimuli called?

• thigmotropism

• heliotropism

• gravitropism

• phototropism

• All of the listed responses are correct

A graduate student growing plant cells in a laboratory dish wants them to __________; therefore, the student treats them with cytokinins.

• grow roots

• establish mycorrhizal associations

• become dormant

• divide

• enlarge

Tags

NGSS.HS-LS1-4

In shoots, branching is inhibited by __________ from the tip of a growing shoot, but this effect is countered by __________ from the roots.

• auxin.... abscisic acid

• auxin...cytokinins

• gibberellins...ethylene

• cytokinins...auxin

Which hormone would a florist most likely spray on cut flowers to keep them fresh?

• gibberellins

• auxin

• ethylene

• cytokinins

The abscission layer __________.

• detects light and measures the photoperiod

• is where a leaf separates from a stem

• is the location of the biological clock in a plant

• causes a shoot to bend toward light

What are circadian rhythms?

• responses to the number of hours of daylight

• metabolic processes related to the light/dark cycling of the environment

• monthly cycles of behavior or physiological change

• innate 24-hour cycles of behavior or physiological change

Photoperiodism is __________.

• an aversion to light

• the ability to perceive shortwave UV light

• an attraction to light

• a physiological response of an organism to alternating light and dark cycles

The synthesis and release of abscisic acid in a plant is a response to __________.

• heat stress

• oxygen deprivation

• salt stress

• water deficit

When a plant that is not adapted to salty water is exposed to salty water, it will __________.

• form air tubes

• thrive

• synthesize and release abscisic acid

• lose water rather than absorb it

Plants have hormones

• True

• False