Exam 31: Plant Responses to Internal and External Signals

Which of the following synthetic auxin functions as a herbicide?

The transduction pathway that activates systemic acquired resistance in plants is initially signaled by

Most scientists agree that global warming is under way;thus,it is important to know how plants respond to heat stress.Which of the following would be a useful line of inquiry to try to improve plant response to and survival of heat stress?

If a long-day plant has a critical night length of 9 hours,which 24-hour cycle would prevent flowering?

Experiments on the positive phototropic response of plants indicate that

A short-day plant will flower only when

Auxin enhances cell elongation in all of these ways except

The proton pump plays a critical role on cell growth response by increasing cell wall plasticity to

The hypersensitive response,a nonspecific defense mechanism,of plants prevents the spread of pathogens by producing ________ around the infection site.

A flash of red light followed by a flash of far-red light given during the middle of the night to a short-day plant will likely

Gibberellins and auxins play a common role in

Which of the following hormones would be most useful in promoting the rooting of plant cuttings?

The most common natural cytokine is zeatin,and it was first discovered in

If a farmer wanted more loosely packed clusters of grapes,he would most likely spray the immature bunches with