Exam 39: Plant Responses to Internal and External Signals

When growing plants in culture, IAA is used to stimulate cell enlargement. Which plant growth regulator has to now be added to stimulate cell division?

Both red and blue light are involved in

A long-day plant will flower if

The biological clock controlling circadian rhythms must ultimately

Plants often use changes in day length (photoperiod)to trigger events such as dormancy and flowering. It is logical that plants have evolved this mechanism because photoperiod changes

Incandescent light bulbs, which have high output of red light, are least effective in promoting

Which of the following watering regimens will be most effective at keeping a lawn green during the hot, dry summer months?

What do the results of research on gravitropic responses of roots and stems show?

A short-day plant exposed to nights longer than the minimum for flowering but interrupted by short flashes of light

Which of the following statements best summarizes the acid growth hypothesis in an actively growing shoot?

If you were shipping green bananas to a supermarket thousands of miles away, which of the following chemicals would you want to eliminate from the plants' environment?

We tend to think of plants as immobile when, in fact, they can move in many ways. Which of the following is a legitimate way in which plants move?

Gravitropism in plant shoots and roots differ in that

The apical bud of a shoot produces ________, resulting in the inhibition of lateral bud growth.

A pathogenic fungus invades a plant. What does the infected plant produce in response to the attack?

In legumes, it has been shown that "sleep" (nastic)movements are correlated with

Charles and Francis Darwin discovered that

Which of the following field treatments would be most likely to result in a wheat or corn field with most of the plants of uniform height?

Which of the following statements applies to plant growth regulators?

Classic experiments suggested that a floral stimulus, florigen, could move across a graft from an induced plant to a noninduced plant and trigger flowering. Recent evidence using Arabidopsis has recently shown that florigen is probably