Exam 37: Plant Signals and Responses to the Environment

Research by Philip A. Wigge has shown that ____.

Darwin's experiments on phototropism illustrated that ____.

Boiling DNA can produce ____.

The most widely used herbicide in the world, 2,4-D, is a synthetic form of ____.

The plant hormones ____ appear to regulate the expression of genes associated with a plant's growth responses to light.

The plant hormone ____ is a gas at normal temperature and pressure.

Imagine that you own a nursery and you want to reduce the chance that plants you ship will suffer from shipping damage. You should you apply ____ to the plants before shipping.

How does thigmotropism affect the growth of a plant?

You observe a sunflower that moves its leaves so that it tracks the sun across the sky through the day, and a sensitive plant that reversibly folds up its leaflets when you touch it. These are both examples of ____.

The plant hormone ____ is generally responsible for long-term inhibition of plant growth such as in buds and seeds.

Plant activities that follow a biological clock so that they are based on cycles of about 24 hours are ____.

Synthetic compounds similar to ____ are used to prolong the shelf life of vegetables such as lettuces and mushrooms and to keep cut flowers fresh.

Typically, ____ does not promote dormancy in perennial plants.

To grow roses commercially, which growing conditions would be optimal?

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.

Explain the hypersensitive response.

The first peptide hormone discovered in plants was ____, which functions in wound response in the tomato.