Question 1

When auxin accumulates on the lower side of the shoot of a germinating seed, it:

Accepted Answer

A)  decreases cell elongation on the lower side of the shoot.
B)  increases cell elongation on the lower side of the shoot.
C)  decreases the use of energy by the cells in the shoot.
D)  increases the use of energy by the cells in the shoot.
E)  has no effect on the shoot (it affects only the developing root) .

Question 2

A scientist who claims to have discovered a new plant hormone must demonstrate that this compound is:

Accepted Answer

A)  produced in large amounts.
B)  needed by the plant as a major source of energy.
C)  formed in one part of the plant but has an effect in a different part.
D)  capable of stimulating differentiated cells to form meristem tissue.
E)  made from cell proteins.

Question 3

Senescence in plants usually involves:

Accepted Answer

A)  shade from other plants.
B)  the formation of an abscission layer.
C)  the presence of cytokinins.
D)  apical dominance.
E)  the development of photosynthetic enzymes.

Question 4

________ triggers the formation of an abscission layer in leaves and fruits.

Accepted Answer

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

Question 5

Misting tomato plants with wintergreen tea can help prevent mosaic virus from infecting the plant. How?

Accepted Answer

The methyl salicylate in the wintergreen...

Question 6

If a poplar forest is attacked by gypsy moths, how do the trees around the infected area tend to become somewhat resistant?

Accepted Answer

Plants that are attacked by in...

Question 7

Discovered in 2007, the hormones that control the timing of flowering are called:

Accepted Answer

A)  auxins.
B)  florigens.
C)  cytokinins.
D)  ethylenes.
E)  abscisic acids.

Question 8

If a coleus plant that has become tall and spindly, what can you do to encourage it to develop lateral branches, so that it becomes bushier?

Accepted Answer

Cut or pinch off the topmost (...

Question 9

Ethylene:

Accepted Answer

A)  promotes gravitropism.
B)  inhibits stem elongation.
C)  prevents leaf senescence.
D)  stimulates seed germination.
E)  causes phototropism.

Question 10

Suppose you have some seeds that refuse to germinate when placed in moist soil. What could you do to encourage the seeds to germinate?

Accepted Answer

A)  Boil them.
B)  Treat them with gibberellin.
C)  Treat them with auxin.
D)  Treat them with abscisic acid.
E)  Put them in direct sunlight.

Question 11

Most scientists believe that the lateral buds nearest the top of a tree are most inhibited from sprouting because they:

Accepted Answer

A)  are most exposed to the light.
B)  are shaded by the apical bud and the top of the tree.
C)  produce gibberellins.
D)  receive the most auxin from the apical bud.
E)  are the most affected by gravity.

Question 12

Auxins are used in rooting powders to encourage the formation of well-branched roots. True or False?

Accepted Answer

A) True 
 B)False

Question 13

Why does removing an overripe, mushy apple from a container of otherwise good apples help preserve the good apples?

Accepted Answer

A)  The overripe apple makes ethylene gas, which can cause the good apples to become overripe.
B)  Ethylene production in the good apples is inhibited by the lack of ethylene production in the overripe apple.
C)  Chemicals in the overripe apple stimulate the conversion of sugar to starch in the good apples.
D)  The production of cytokinins is inhibited in the remaining good apples.
E)  Gibberellins help preserve the good apples.

Question 14

Placing a ripe apple in a bag of green bananas will cause the bananas to ripen quickly. This is because the apple:

Accepted Answer

A)  absorbs cytokinin.
B)  forms digestive enzymes.
C)  makes auxin.
D)  produces ethylene gas.
E)  releases heat.

Question 15

Auxin:

Accepted Answer

A)  inhibits stem elongation.
B)  promotes phototropism.
C)  stimulates flowering.
D)  promotes cell division.
E)  causes the development of an abscission layer.

Question 16

Elongation of cells in stems is promoted by:

Accepted Answer

A)  ethylene and cytokinins.
B)  auxins and gibberellins.
C)  enzymes and phytochromes.
D)  abscisic acid and ethylene.
E)  cytokinins and abscisic acid.

Question 17

What happens to phytochromes after several days of dark, rainy weather?

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 18

An insect that twice touches a Venus fly trap hair changes a(n) ________ stimulus into a(n) ________ signal.

Accepted Answer

A)  electrical; chemical
B)  touch; electrical
C)  osmotic; mechanical
D)  mechanical; touch

Question 19

________ maintains seed dormancy, and ________ ends seed dormancy by stimulating enzymes that break down the food reserves of the seed to fuel seedling growth.

Accepted Answer

A)  Gibberellin; abscisic acid
B)  Abscisic acid; gibberellin
C)  Auxin; cytokinin
D)  Cytokinin; auxin
E)  Abscisic acid; ethylene a

Question 20

What will happen to a long-day plant, such as spinach, if the dark period is interrupted by a flash of light for several days in a row during the spring?

Accepted Answer

A)  Nothing will happen; growth and development will continue as normal.
B)  The plants will flower early.
C)  The plants will be delayed in flowering.
D)  The plants won't flower that season.

Exam 45: Plant Responses to the Environment

Placing a ripe apple in a bag of green bananas will cause the bananas to ripen quickly. This is because the apple:

Correct AnswerverifiedShow Answer

If a coleus plant that has become tall and spindly, what can you do to encourage it to develop lateral branches, so that it becomes bushier?

Correct AnswerverifiedCut or pinch off the topmost (...View AnswerShow Answer

________ maintains seed dormancy, and ________ ends seed dormancy by stimulating enzymes that break down the food reserves of the seed to fuel seedling growth.

Correct AnswerverifiedShow Answer

Elongation of cells in stems is promoted by:

Correct AnswerverifiedShow Answer

Ethylene:

Correct AnswerverifiedShow Answer

What happens to phytochromes after several days of dark, rainy weather?

Correct AnswerverifiedShow Answer

Misting tomato plants with wintergreen tea can help prevent mosaic virus from infecting the plant. How?

Correct AnswerverifiedThe methyl salicylate in the wintergreen...View AnswerShow Answer

If a poplar forest is attacked by gypsy moths, how do the trees around the infected area tend to become somewhat resistant?

Correct AnswerverifiedPlants that are attacked by in...View AnswerShow Answer

When auxin accumulates on the lower side of the shoot of a germinating seed, it:

Correct AnswerverifiedShow Answer

Why does removing an overripe, mushy apple from a container of otherwise good apples help preserve the good apples?

Correct AnswerverifiedShow Answer

Suppose you have some seeds that refuse to germinate when placed in moist soil. What could you do to encourage the seeds to germinate?

Correct AnswerverifiedShow Answer

What will happen to a long-day plant, such as spinach, if the dark period is interrupted by a flash of light for several days in a row during the spring?

Correct AnswerverifiedShow Answer

Senescence in plants usually involves:

Correct AnswerverifiedShow Answer

Auxin:

Correct AnswerverifiedShow Answer

An insect that twice touches a Venus fly trap hair changes a(n) ________ stimulus into a(n) ________ signal.

Correct AnswerverifiedShow Answer

Auxins are used in rooting powders to encourage the formation of well-branched roots. True or False?

Correct AnswerverifiedShow Answer

________ triggers the formation of an abscission layer in leaves and fruits.

Correct AnswerverifiedShow Answer

A scientist who claims to have discovered a new plant hormone must demonstrate that this compound is:

Correct AnswerverifiedShow Answer

Discovered in 2007, the hormones that control the timing of flowering are called:

Correct AnswerverifiedShow Answer

Most scientists believe that the lateral buds nearest the top of a tree are most inhibited from sprouting because they:

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified
Cut or pinch off the topmost (...
View Answer

maintains seed dormancy, and ends seed dormancy by stimulating enzymes that break down the food reserves of the seed to fuel seedling growth.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The methyl salicylate in the wintergreen...
View Answer

Correct Answer
verified
Plants that are attacked by in...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

An insect that twice touches a Venus fly trap hair changes a(n) stimulus into a(n) signal.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified