Question 1

________________ is directional growth responses of plants to a unidirectional source of light.

Accepted Answer

A) Gravitropism 
B) Thigmotropism 
C) Dormancy 
D) Phototropism 
A) Gravitropism 
B) Thigmotropism 
C) Dormancy 
D) Phototropism

Question 2

When one plant is shaded by another, why is the ratio of far-red to red light increased compared to an unshaded plant?

Accepted Answer

A) Phytochrome in the taller plant absorbs most of the red light. 
B) Auxin absorbs mostly far-red light. 
C) As light passes through the leaves of the taller plant, most of the red light is absorbed by chlorophyll. 
D) Far-red light mostly reflects off the surface of the soil while red light is mostly absorbed. 
A) Phytochrome in the taller plant absorbs most of the red light. 
B) Auxin absorbs mostly far-red light. 
C) As light passes through the leaves of the taller plant, most of the red light is absorbed by chlorophyll. 
D) Far-red light mostly reflects off the surface of the soil while red light is mostly absorbed.

Question 3

During a viticulturist's presentation on growing and managing grapes, why did he state that it is imperative to encourage the grapevine's natural tendency for positive thigmotropism?

Accepted Answer

A) To encourage the vine's response to move toward the early morning light as opposed to the late afternoon sun. 
B) To encourage the roots to grow deeper and spread out. 
C) To encourage the grapes to retain their sugar for a longer period of time. 
D) To encourage the twining stems to wrap around the supporting wires. 
A) To encourage the vine's response to move toward the early morning light as opposed to the late afternoon sun. 
B) To encourage the roots to grow deeper and spread out. 
C) To encourage the grapes to retain their sugar for a longer period of time. 
D) To encourage the twining stems to wrap around the supporting wires.

Question 4

While touring the ancient Egypt exhibit at the local history museum, you learn that ancient Egyptians would slash figs in order to stimulate ripening.Based on your knowledge of plant hormones you hypothesize that wounding the figs must release:

Accepted Answer

A) abscisic acid. 
B) gibberellin. 
C) indoleacetic acid. 
D) ethylene. 
A) abscisic acid. 
B) gibberellin. 
C) indoleacetic acid. 
D) ethylene.

Exam 40: Sensory Systems in Plants

________________ is directional growth responses of plants to a unidirectional source of light.

When one plant is shaded by another, why is the ratio of far-red to red light increased compared to an unshaded plant?

During a viticulturist's presentation on growing and managing grapes, why did he state that it is imperative to encourage the grapevine's natural tendency for positive thigmotropism?

While touring the ancient Egypt exhibit at the local history museum, you learn that ancient Egyptians would slash figs in order to stimulate ripening.Based on your knowledge of plant hormones you hypothesize that wounding the figs must release:

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