Exam 38: Plant Signals and Responses to the Environment

Specific cells in developing seeds and maturing fruits have receptors for ethylene, but cells in stems generally do not.

Tropisms explain how plants can move from place to place.

What are secondary metabolites that function to protect plants from viral, fungal, and bacterial pathogens?

How might a plant communicate to another plant that it has been attacked by a herbivore?

External cues such as increasing day length or warming after a cold snap stimulate gibberellin synthesis, which results in bolting in plants such as cabbages.

The most widely accepted hypothesis for how plants detect gravity posits that plants detect gravity the same why animals detect gravity.

Which type of plant hormone governs senescence in plants, such as the loss of leaves in autumn by some plants?

Which plant hormones were first discovered in experiments to define the nutrient media required for plant tissue culture?

Light of which wavelengths is the main stimulus for phototropism?

What does P_r primarily absorb during daylight hours?

Which plant hormones are primarily responsible for promoting the formation of lateral roots?

Which of the following is the most important natural auxin?

Choose the type of plant chemical most closely associated with the action given below. Each chemical may be used more than once. -acting as an enzyme

What did Darwin's experiments on phototropism illustrate?

Describe the various effects of auxins in plants.

Which of the following are chaperone-type proteins that stabilize other proteins in response to environmental stresses such as salinity, drought, heat, and cold?

Which type of plant hormone is primarily responsible for inhibiting growth of lateral meristems on shoots and restricting the formation of branches?

After a plant has survived a microbial invasion, the rest of the plant is often less vulnerable to future infections. What is this called?

Where is the growth-promoting substance that promotes stem elongation and bending toward light primarily produced?

Which plant hormones would be used by commercial grape growers to get larger grapes by lengthening the stem on which fruits develop?