Question 1

What causes the "leaf drop" that occurs in woody plants in preparation for winter dormancy?

Accepted Answer

A) suppressed auxin production 
B) increased chlorophyll development 
C) inhibition of gibberellin 
D) increased ethylene production 
E) opened stomata

Question 2

An old gardening folk tradition uses a "tea" made by soaking the stem tips of willows in water overnight and then using the tea to water cuttings. This is supposed to encourage root formation. Does it work? Why?

Accepted Answer

The answer of An old gardening folk tradition uses a...

Question 3

If you want to keep cut flowers fresh, treat them with:

Accepted Answer

A) auxin. 
B) gibberellin. 
C) cytokinin. 
D) ethylene. 
E) abscisic acid.

Question 4

Cutting a hedge with a trimmer stimulates it to become bushy because:

Accepted Answer

A) removing the apical meristems makes more auxin, which stimulates lateral branch buds to grow. 
B) removing the apical meristems makes less ethylene, which stimulates lateral branches to grow. 
C) removing the apical meristems results in less auxin, which results in more lateral branch growth. 
D) removing the lateral buds results in apical dominance under the influence of cytokinins.

Question 5

People should not "torment" their Venus flytrap plant with toothpicks or other indigestible objects (to show off its ability to close its trap)because the plant uses up much of its supply of ________ every time the trap closes.

Accepted Answer

The answer of People should not "torment" their Venus flytrap...

Question 6

A plant's tendency to grow toward a source of light is called:

Accepted Answer

A) phototropism. 
B) lumitropism. 
C) gravitropism. 
D) amylotropism. 
E) thigmotropism.

Question 7

A group of plant geneticists discovers a mutant plant that has a deficiency in gibberellin production. All other hormones, including auxins, cytokinins, florigens, ethylene, and abscisic acid, are produced in normal quantities and are not directly affected by this mutation. Based on this scenario, the mutant plant most likely exhibits:

Accepted Answer

A) a lack of phototropism in the shoots. 
B) a lack of gravitropism in the roots. 
C) delayed senescence. 
D) a dwarf growth pattern (very short stem). 
E) stomata that don't close.

Question 8

What kinds of hormonal changes occur as trees prepare for winter dormancy?

Accepted Answer

The answer of What kinds of hormonal changes occur as...

Question 9

________ induces dormancy in seeds and buds and causes stomata to close?

Accepted Answer

A) Auxin 
B) Ethylene 
C) Abscisic acid 
D) Cytokinin 
E) Gibberellin

Question 10

Shoots grow up and roots grow down due to thigmotropism. True or False?

Accepted Answer

A) True 
 B)False

Question 11

Willow trees and many other plants produce ________, from which aspirin is made.

Accepted Answer

A) nicotine 
B) acetaminophen 
C) acetic acid 
D) salicylic acid 
E) volantin

Question 12

At night, when little red light is available to the plants in an area:

Accepted Answer

A) Pr and Pfr are both destroyed. 
B) Pr and Pfr are both formed from inactive phytochrome. 
C) Pr is converted to Pfr. 
D) Pfr is converted to Pr. 
E) Pr stimulates flowering.

Question 13

Seed germination is stimulated by:

Accepted Answer

A) auxin. 
B) gibberellin. 
C) cytokinin. 
D) ethylene. 
E) abscisic acid.

Question 14

Some plants under attack by insects can communicate this information to other parts of the same plant and to nearby plants via:

Accepted Answer

A) vibrations in their roots. 
B) the release of chemicals into their roots. 
C) the release of chemicals into the air. 
D) low-frequency sound waves.

Question 15

How do auxin and cytokinin interact to affect the shape and growth of a plant?

Accepted Answer

The answer of How do auxin and cytokinin interact to...

Question 16

What caterpillar saliva-based chemical stimulates a corn plant to release an alarm signal?

Accepted Answer

A) florigen 
B) methyl salicylate 
C) salicylic acid 
D) volicitin 
E) salicin

Question 17

Cytokinins cause most of their responses in plants by stimulating cell ________.

Accepted Answer

The answer of Cytokinins cause most of their responses in...

Question 18

In the late winter, as seeds prepare to germinate, the levels of ________ in seeds should be declining as the levels of ________ are increasing.

Accepted Answer

The answer of In the late winter, as seeds prepare...

Question 19

The two hormones involved in seed germination and seed dormancy are:

Accepted Answer

A) auxin and ethylene. 
B) abscisic acid and gibberellin. 
C) ethylene and cytokinin. 
D) gibberellin and auxin. 
E) cytokinin and auxin.

Question 20

What mechanisms do plants use to discourage predation?

Accepted Answer

The answer of What mechanisms do plants use to discourage...

Exam 45: Plant Responses to the Environment