Exam 39: Plant Responses to Internal and External Signals

The houseplants in a windowless room with only fluorescent lights begin to grow tall and leggy. Which of the following treatments would promote more normal growth?

Auxin triggers the acidification of cell walls, which results in rapid growth, but also stimulates sustained, long-term cell elongation. What best explains how auxin brings about this dual growth response?

A plant mutant that shows normal gravitropic bending but does not store starch in its plastids would require a reevaluation of the role of ________ in gravitropism.

The detector of light during de-etiolation (greening)of a tomato plant is (are)

A short-day plant will flower only when

What would happen if the secondary messenger cGMP was blocked in the de-etiolation pathway?

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

The following questions refer to the description below. Plants are not able to move away from predators, so they have evolved chemical methods to protect themselves. Biologists have observed that caterpillars munching on a leaf can be attacked by certain species of wasps. These wasps lay their eggs inside the caterpillar's body, and when the eggs hatch, the larvae feed on its host from the inside. -Wasps that are free-living but lay their eggs in another species, such as described above, are called

The ripening of fruit and the dropping of leaves and fruit are principally controlled by

Which of the following statements applies to plant growth regulators?

You are part of a desert plant research team trying to discover crops that will be productive in arid climates. You discover a plant that produces a hormone under water-deficit conditions that triggers a suite of drought responses. Most likely the hormone is

Why are lateral buds often inhibited from sprouting even though a stem may be actively elongating?

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

Which of the following is a likely response of plants to cold stress?

While ________ inhibit(s)early germination, ________ regulate(s)cell division in shoots and roots.

In cases where plants exhibit generalized defence responses in organs distant from the infection site, this is termed

Auxins (IAA)in plants are known to affect all of the following phenomena except

Which of the following is the most likely plant response to an attack by herbivores?

Similar to other hormones, gibberellins affect plant development in several ways, except to

A long-day plant will flower if