Exam 38: Plant Developmental Responses to External and Internal Signals

If you wanted to develop an herbicide that was structurally most similar to cytokinin, which of the following molecules would you use as starting material?

The "stress hormone" involved in stomatal closure during water stress is:

MATCHING Match the plant hormone with its description. a.abscisic acid d.cytokinin b.auxin e.ethylene c.brassinosteroid f.gibberellin -indoleacetic acid

Changing day length, as well as variations in precipitation and temperature, are environmental cues that exert an important influence on:

During the day the leaves of bean plants are __________, and at night they are __________.

After the sun goes down:

Pr is located in the __________, and after it absorbs red light, the resulting Pfr moves to the __________.

A long day plant will flower when exposed to short nights. ____________________

MATCHING Match the plant hormone with its description. a.abscisic acid d.cytokinin b.auxin e.ethylene c.brassinosteroid f.gibberellin -delays senescence

The purification and elucidation of the primary auxin's chemical structure were accomplished by:

The herbicides (weed killers) 2,4-D and 2,4,5-T are examples of synthetic:

Auxin produced by the apical meristem inhibits the germination of lateral buds. ____________________

Plants compete for light, a response known as __________, in which plants tend to grow taller when closely surrounded by other plants.

__________ is a synthetic auxin that stimulates root development on stem cuttings and is used extensively in asexual propagation.

Which of the following statements concerning cryptochrome is FALSE?