Exam 37: Plant Signals and Responses to the Environment

What are chitinases examples of?

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

Which of the following is the most important natural auxin?

Some signalling chemicals, such as oligosaccharins, are only synthesized when a tissue is damaged.

Which plant hormones can be produced by boiling DNA?

Choose the type of plant chemical or its action most closely associated with the consequence listed below. Each chemical or action may be used more than once. -triggering synthesis of phytoalexins

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

Choose the type of plant chemical or its action most closely associated with the consequence listed below. Each chemical or action may be used more than once. -acting as antibiotic

Chrysanthemums are short-day plants, requiring a night length of longer than 12 hours to flower. Under which of the following conditions should chrysanthemums flower?

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

What is the most widely used herbicide in the world, 2,4-D, a synthetic form of?

Describe the various effects of auxins in plants.

Which plant hormones appear to regulate the expression of genes associated with a plant's growth responses to light?

Which plant hormones were first isolated from the pollen of Brassica napus?

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

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.

Plant cell walls grow faster in a neutral environment-that is, when the pH is close to 7.

Imagine that you want all of the orange trees in your orchard to uniformly flower and set fruit. Which type of plant hormone should you spray on your plants?

Which of the following terms describes plant activities that follow a biological clock so that they are based on cycles of about 24 hours?

Which of the following is NOT known to be influenced by plant hormones?