Exam 37: Plant Signals and Responses to the Environment

Describe the various effects of auxins in plants.

The most widely accepted hypothesis for gravitropism proposes that plants detect gravity much the same way animals detect gravity.

During daylight hours, primarily ____.

The plant hormone structurally similar to adenine is ____.

An agar block filled with auxin is placed on top of a shoot that has had the shoot tip removed. The agar block is placed so that it covers only one side of the top of the shoot. You would expect the shoot to ____.

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

Bioactive specialized compounds are ____.

A plant hormone has the same effects in different plant tissues.

____ were first discovered in experiments to define the nutrient media required for plant tissue culture.

The plant hormone ____ stimulates stomata to close during a drought.

Plant ____ are not known to be influenced by plant hormones.

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

A pea plant that is not able to make GA₁will ____.

Statoliths, particles that move in the direction gravity pulls them, are typically ____ in plants.

In the back and forth evolutionary struggle between plants and virulent bacteria, plants use ____ immunity to combat the bacteria.

The second messenger inositol triphosphate (IP₃) appears to be involved in stomatal closure triggered by ____.

Fruit ripening is promoted by ____.

The plant hormone ____ is primarily responsible for helping break the dormancy of seeds and buds.

Larrea tridenta is chemically defended against most herbivores and some are able to survive t housands of years.

The creosote bush exhibits ____, an adaptation that evolved as a response to their biotic environment.