Chapters 11/12 Quiz

Question 1

Which of the following is NOT a general characteristic of a hormone?

• responses to hormones and their interaction are completely understood
• effective only at certain times
• active in low concentrations
• perceived at a certain location

Answer 1

-responses to hormones and their interaction are completely understood

Question 2

produced at tips; moves downward; responsible for tropisms and apical dominance; promotes rooting

Answer 2

auxins

Question 3

produced at meristems (particularly RAM); moves upward; responsible for cell division; promotes shoot initiation

Answer 3

cytokinins

Question 4

extracted from a fungus; responsible for cell elongation; may help break dormancy

Answer 4

gibberellins

Question 5

discovered in 1979 in canola; promotes seed yield; helps plant resist environmental stress; promotes stem elongation

Answer 5

brassinosteroids

Question 6

active as a gas; aging hormone; promotes ripening and senescence; stress hormone

Answer 6

ethylene

Question 7

promotes root growth in response to drought; signals stomate closure

Answer 7

abscisic acid (ABA)

Question 8

found throughout the plant; wounding increases production; triggers production of chitinases and proteinase inhibitors

Answer 8

jasmonates

Question 9

A product called Sucker Punch is advertised to help prevent dormant buds from breaking. This product is supposed to prevent suckers and water sprouts. What is most likely the active hormone ingredient?

Answer 9

auxins

Question 10

The changes induced in a plant by pinching or disbudding are mediated by which hormone?

Answer 10

auxins

Question 11

T/F: We can apply chemicals that will literally shrink a plant.

Answer 11

False

Question 12

How do growth retardants work?

Answer 12

they keep the internodes from elongating as much

Question 13

Seedless grapes, red delicious apples and celery that you buy in the grocery store most likely have been treated with _____________________ to help them elongate more.

Answer 13

gibberellic acid

Question 14

Ethephon is a chemical used to loosen cherries and citrus fruits that are used for processing to aid in harvest. It’s active hormone is ______________.

Answer 14

ethylene

Question 15

T/F: Plant phenotype is an interaction of the genotype and the environment. Changes in a plant’s phenotype due to environmental triggers are hormone-driven.

Answer 15

True