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Exam 26: Flowering Plants: Control of Growth Responses

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Question 31

Multiple Choice

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What is the tropism that describes the movement of a plant towards light?

A) negative gravitropism
B) positive gravitropism
C) thigmotropism
D) negative phototropism
E) positive phototropism

F) B) and C)
G) All of the above

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Question 32

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. -Went's experiment in 1926 with oat coleoptiles showed that agar that absorbed auxin from the tips would cause a tipless shoot to curve away from the side where he had placed the agar,suggesting that auxin causes cells to elongate.

A) True
B) False

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Question 33

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. -Long-day plants flower when the day length is longer than the critical period.

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. -Long-day plants will never flower if the day length is shorter than the critical period.

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. -In order for hormones like auxin to be used as a chemical signal within a plant it must travel through the xylem to reach the site of activity.

The Pr → Pfr conversion cycle is known to control various growth functions in plants.Which of the following functions does the cycle NOT control?

Which of the following events will occur in response to gravitropism?

If you are trying to alter the defensive mechanisms of a plant,which component of the signal transduction pathway would be the ideal place to do this?

Explain how abscisic acid promotes the closure of stomates.Identify the molecules involved at each step. A.________ B.________ C.________ D.________

Which of the following ions is associated with auxin and used during signal transduction that causes a plant to bend towards a light source?

Which of the following plant hormones is used to prolong the life of flower cuttings and stored vegetables?

Which statement about plant hormones is NOT true?