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Exam 26: Flowering Plants: Control of Growth Responses

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Question 21

Multiple Choice

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Which of the following statements is NOT correct about a circadian rhythm?

A) An example is the opening of stomata in the morning and their closing at night.
B) These rhythms tend to persist even in the absence of daily light cues.
C) If plants are maintained in total darkness or total light,their circadian rhythm acts on a faster time scale.
D) The primary usefulness of circadian rhythms seems to be to measure day-length changes so plants respond appropriately to seasonal environmental changes.

E) A) and B)
F) None of the above

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Question 22

True/False

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The cylinders in this experiment represent a 24-hour period. The light area represents light periods during a 24-hr. period and the dark area represents dark periods during a 24-hr. period. The critical length of dark vs. light periods for flowering is depicted by the dotted line. Note that some plants are flowering and some are not flowering. Study the results of this experiment on photoperiodism and flowering to determine whether the following statements are true or false. -Short-day plants flower when the day length is shorter than the critical length,but the required dark period is interrupted by a flash of light.

A) True
B) False

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Question 23

Multiple Choice

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Which of the following plant hormones is associated with the closure of stomata in a plant under water stress?

Which of the following is (are) an effect(s) of auxin?

Photoperiodism requires

The cylinders in this experiment represent a 24-hour period. The light area represents light periods during a 24-hr. period and the dark area represents dark periods during a 24-hr. period. The critical length of dark vs. light periods for flowering is depicted by the dotted line. Note that some plants are flowering and some are not flowering. Study the results of this experiment on photoperiodism and flowering to determine whether the following statements are true or false. -The conclusion drawn from these results is that the length of the dark period,not the light period,controls flowering.

Horticulturists often use ________ and other growth regulators applied as a paste to plant cuttings to stimulate root formation.

A hormone that causes cell division and is found in coconut milk and in dividing root tissue is

The cylinders in this experiment represent a 24-hour period. The light area represents light periods during a 24-hr. period and the dark area represents dark periods during a 24-hr. period. The critical length of dark vs. light periods for flowering is depicted by the dotted line. Note that some plants are flowering and some are not flowering. Study the results of this experiment on photoperiodism and flowering to determine whether the following statements are true or false. -Short-day plants flower when the day length is longer than the critical length.

Which of the following plant hormones is associated with the closure of stomata when a plant experiences water stress?

Describe how phytochrome is used to determine plant spacing.

Indoleacetic acid (IAA) is the most commonly occurring form of which of the following plant hormones?

Which of the following hormones are believed to be involved in abscission?

In order for signal transduction to work properly in plants,the

The cylinders in this experiment represent a 24-hour period. The light area represents light periods during a 24-hr. period and the dark area represents dark periods during a 24-hr. period. The critical length of dark vs. light periods for flowering is depicted by the dotted line. Note that some plants are flowering and some are not flowering. Study the results of this experiment on photoperiodism and flowering to determine whether the following statements are true or false. -Thigmomorphogenesis is a touch response where the whole plant responds to an environmental stimulus.

How does auxin actually cause stems to curve towards the light?

A chemical messenger from the embryo that stimulates a seed to digest the endosperm is

The general sequence by which a plant responds to external stimuli is

The cylinders in this experiment represent a 24-hour period. The light area represents light periods during a 24-hr. period and the dark area represents dark periods during a 24-hr. period. The critical length of dark vs. light periods for flowering is depicted by the dotted line. Note that some plants are flowering and some are not flowering. Study the results of this experiment on photoperiodism and flowering to determine whether the following statements are true or false. -Auxin stimulates leaf release,while ethylene keeps leaves from falling.

Explain how the stems and roots of a plant will respond at the cellular level if it is placed upon its side.