Deck 28: Flowering Plants: Plant Behavior

Question 1

You leave for winter vacation and forget to water your plants for two whole weeks! You also turned down the heat and closed the blinds.What hormone is most likely to be produced in response to these conditions?

A)Gibberellins
B)Abscisic acid
C)Cytokinins
D)Auxins

Answer 1

B

Question 2

You isolate a plant that expresses a phytochrome mutant that is always in the P_fr form.You expect these plants will germinate:

A)not at all.
B)regardless of the light conditions.
C)later than normal plants.
D)similarly to normal plants.

Answer 2

B

Question 3

Which one of the following is considered to be an important plant hormone that helps plants cope with environmental stresses?

A)Auxins
B)Prostaglandins
C)Ethylene
D)Abscisic acid
E)Cytokinins

Answer 3

D

Question 4

Auxins primarily flow downward in shoots and roots and this transport is called:

A)bipolar
B)polar
C)nonpolar
D)tripolar
E)dipolar

Question 5

Abscisic acid is an important signal,transported from roots to the stem and leaves during times of water stress,that prevents:

A)additional auxin production.
B)ethylene buildup in the stems.
C)leaf drop.
D)phototropism.
E)stomatal opening.

Question 6

Roots contain starch-heavy plastids known as:

A)chloroplasts
B)plastoplasts
C)chromoplasts
D)statoliths
E)strongoliths

Question 7

Which of the following are physical stimuli that influence plant responses?

A)rocks,light,touch,music
B)water,gravity,temperature,soil minerals,microorganisms
C)wind,temperature,fungi
D)CO₂,light,water vapor,gravity
E)touch,gravity,herbivores,pathogens

Question 8

One application of auxins is its use in the production of:

A)fruit overgrowth
B)fruit size increase
C)fruit ripening
D)fruit lacking seeds
E)None of these is correct

Question 9

Which one of the following is not a major plant hormone?

A)auxins
B)brassinosteroids
C)ethylene
D)cytokinins
E)ethanol

Question 10

In Barrow,Alaska,the sun does not set for several months in the summer.Based on what you know about photoperiodism,what type of plant is most likely to flower during the summer in Barrow?

A)Long-day plants
B)Short-day plants
C)Day-neutral plants

Question 11

In roots auxins tend to ________ cell elongation,in stems they promote cell elongation.

A)promote
B)not influence
C)have little effect on
D)not be a factor in
E)inhibit

Question 12

The main reason certain seeds germinate near the soil surface rather than deep in the soil is:

A)they need additional oxygen.
B)they are then more aware of their surroundings.
C)they require light to germinate.
D)they have water deprivation.
E)they are sensitive to the cold temperatures of the soil.

Question 13

Cytokinins are plant hormones that usually affect cell:

A)elongation.
B)growth.
C)division.
D)wall expansion.
E)turgor pressurE.

Question 14

Which of the following is the role of calcium-dependent protein kinases?

A)receptor molecule
B)affector molecule
C)messenger molecule
D)effector molecule
E)all of the choices

Question 15

Plant roots that are in a horizontal position grow down because:

A)Cells on the upper side elongate more than those on the lower side.
B)Auxins are stimulating cells on the lower side to elongate more.
C)Auxins are being pulled to the upper side.
D)Auxins are having no influence on this process.
E)Statoliths are pushing auxins to the upper sidE.

Question 16

Gravitropism is defined as:

A)growth in response to the Earth's magnetic field.
B)gravity's pull on certain plant organs.
C)growth in response to the force of gravity.
D)any response to gravity that changes cell structures.
E)growth mostly away from gravity.

Question 17

Plant hormones bind specific cellular receptor molecules that trigger gene expression responses.Which statement is correct concerning these responses?

A)Only cells lacking receptors can bind hormones.
B)Only cells in the meristem can respond.
C)Only cells that express the appropriate receptors can bind hormones.
D)Only cells that have been previously activated can bind hormones.
E)None of these choices is correct.

Question 18

Short-day plants are those that flower only when the night period of a plant is:

A)longer than a defined period
B)shorter than 12 hours
C)followed by short periods of light interruptions
D)less than that in summer
E)longer than 12 hours

Question 19

Certain trees tend to grow straight and tall with few lateral branches when compared to other trees.In these trees

A)lateral buds are overactive.
B)lateral bud development is dependent on temperature.
C)more gibberellins are produced compared to trees with many lateral branches,and the gibberellins affect the buds detrimentally.
D)more auxins are produced compared to trees with many lateral branches,and the auxins inhibit lateral bud development.

Question 20

Ethylene has the effect of causing fruits to:

A)enlarge
B)ripen
C)shrink
D)elongate
E)increase in juice content

Question 21

Select the reaction that is most likely to be a tropism.

A)Flowers blooming when it is warm
B)Production of aerenchyma
C)Plants bending away from a heat source
D)Induction of seed dormancy

Question 22

One reason auxins are called the "master plant hormones" is because they mostly work apart from other hormones.

Question 23

Several plants of the same type are grown individually under separate glass covers.One plant is attacked by a herbivore.This plant will be able to use __________ to induce defenses in _________ but not _________.

A)Jasmonic acid;nearby plants;itself
B)Systemin;nearby plants;itself
C)Jasmonic acid;itself;nearby plants
D)Auxin;itself;nearby plants

Question 24

Plant behavior is defined as response to stimuli.

Question 25

The response to touch by such plants as the sensitive plant is due to:

A)changes in water content of cells.
B)auxin displacement in the touched area.
C)effect of gibberellins on the area affected.
D)sensitive responder cells.

Question 26

Brassinosteroids produced by plants are closely related chemically to animal steroid hormones.

Question 27

Plants have been shown to elicit defense responses upon recognition of part of the bacterial flagella,a structure important for bacterial locomotion.The flagella is likely to be sensed by:

A)hormones.
B)the product of a resistance gene.
C)jasmonic acid.
D)elicitors.

Question 28

Which sequence of events is true about phtyochrome?

A)Red light activates phytochrome,converting it to P_fr,activated P_fr moves to the nucleus,then P_r is a receptor for red light in the cytosol.
B)P_r is a receptor for red light in the cytosol,red light activates phytochrome,converting it to P_fr,then activated P_fr moves to the nucleus.
C)P_r is a receptor for red light in the cytosol,activated P_fr moves to the nucleus,then red light activates phytochrome,converting it to P_fr.

Question 29

You are studying a plant with mutant,non-functional PIN proteins.Assuming this plant could otherwise develop normally,predict how you might expect this plant to respond to directional light.

A)The plant will bend toward the light.
B)The plant will bend away from the light.
C)The plant will not move in response to light.
D)The plant will move randomly.

Question 30

The expression "one bad apple spoils the whole bunch" probably has to do with the action of ethylene on fruit ripening.

Question 31

Which steps compose a plant's triple response to ethylene?

A)Seedlings bend toward the sun,seedling stem thickens,and the seedling stem bends,forming a hook.
B)Seedling stem stops elongating,seedling stem thickens,and the seedling stem bends,forming a hook.
C)Seedling stem stops elongating,seedling stem thickens,and the seedling undergoes apoptosis.
D)Seedling bends away from the sun,seedling stem thickens,and the seedling stem bends,forming a hook.