Deck 36: Flowering Plants: Behavior

Question 1

Which of the following is considered to be a plant behavior?

A) response to sunlight
B) response to plant hormones
C) response to touch
D) response to gravity
E) all of the choices

Answer 1

all of the choices

Question 2

Which one of the following is most correct concerning plant behavior?

A) It is influenced by external factors such as electrical impulses.
B) It is influenced by internal factors such as plant growth regulators.
C) It is influenced by internal factors such as gravity.
D) It is influenced by external factors such as microRNAs.
E) None of these choices is correct.

Answer 2

It is influenced by internal factors such as plant growth regulators.

Question 3

Plant behaviors are not always easily observed because they:

A) may occur at short intervals
B) are mostly internal to the plant
C) are mostly caused by internal organisms
D) are not observable by the human eye
E) are only observable with a microscope

Answer 3

may occur at short intervals

Question 4

If growers want fruit to drop from trees simultaneously they might apply:

A) auxins
B) ethylene
C) abscisic acid
D) gibberellins
E) brassinosteroids

Question 5

The primary reason why certain trees tend to grow straight and tall with few lateral branches when compared with other trees is because:

A) of unknown reasons
B) Lateral buds are missing in many of these trees
C) Lateral bud development is dependent on temperature
D) Gibberellins affect the buds detrimentally
E) Auxins inhibit lateral bud development

Question 6

If a plant is bending towards the light, one would expect which enzymes to have increased in activity?

A) auxins
B) gibberellins
C) wall-loosening enzymes
D) ethylene
E) None of these is correct

Question 7

The best place to find gibberellins in a plant would be in the:

A) apical buds
B) roots
C) young leaves
D) seed embryos
E) All of these are correct

Question 8

If a producer wants to prevent certain fruits from ripening they would apply:

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

Question 9

Use of cytokinins has had wide application in the horticultural industry because cytokinins are used in:

A) tissue cultures
B) fruit production
C) stem elongation
D) flower maturation
E) root development

Question 10

Gibberellins were discovered as a result of:

A) extractions of this hormone from plants
B) a fungal disease on rice
C) an application of the hormone accidentally
D) many years of experiments to isolate it from plants
E) discovery of its relationship to auxins

Question 11

One of the important roles of ethylene in plant development is that it induces radial swelling in:

A) root and stem seedling development
B) embryo expansion
C) seed germination
D) stem elongations
E) auxin production

Question 12

The plant hormone that prevents seed germination even if conditions of temperature and moisture conditions are appropriate would be:

A) auxins
B) gibberellins
C) ethylene
D) abscisic acid
E) brassinosteroids

Question 13

Which of the following is a plant behavior that is influenced by light?

A) solar tracking
B) phototropism
C) flowering
D) seed germination
E) All of the choices are true

Question 14

Phototropism is a plant response controlled largely by which color of light?

A) red
B) blue
C) violet
D) green
E) None of the choices is correct

Question 15

Phytochrome is a light receptor that influences:

A) stomata opening and closing
B) leaf drop
C) stem elongation
D) active transport in cell membranes
E) flowering

Question 16

When phytochromes mediate plant responses to shading they could cause:

A) leaves to fall off
B) leaves to turn towards the light
C) no influence on leaves
D) extension of shade leaves into the light
E) leaves to turn brown

Question 17

Certain plants may form tissues called ________ when their roots are flooded, whereas other plants may always form these tissue types.

A) parenchyma
B) collenchyma
C) sclerenchyma
D) aerenchyma
E) None of the choices is correct

Question 18

Certain plants that grow in environments where their roots are often under water need to provide ways of getting which of the following to the roots?

A) carbon dioxide
B) carbon monoxide
C) hydrogen
D) nitrogen
E) oxygen

Question 19

Which one of the following would be the effect of salty environments on plants?

A) loss of water
B) damage to membranes
C) uptake of salt that causes toxicity
D) water intake that causes turgid cells
E) damage to plant proteins

Question 20

If plant breeders were to breed plants for release of certain compounds that attracted wasps this could help protect the plants from

A) other insects
B) herbivores
C) certain caterpillars
D) All of these are correct.
E) None of these is correct.

Question 21

Plant hormones (growth regulators) can travel from cell to cell within the plant only if they are moved by electrical impulses.

Question 22

Plants grow towards light because they sense a need for light.

Question 23

The production of roots on cuttings of a houseplant is promoted when auxins are applied to the cut ends.

Question 24

Auxins are able to move vertically; however, they are restricted in movement laterally.

Question 25

Plant pathogenic fungi are often able to attack plants because they have mechanisms for overcoming the plant's defense system.

Question 26

The plant hypersensitive response is one in which the plant is unable to defend itself against a pathogen.

Question 27

Generally plants are unable to produce chemicals that travel throughout the plant to protect against pathogens; most defense is only in localized areas.

Question 28

When scientists breed for genes for resistance to pathogens or herbivores they are usually limited to making mutations for this to happen.

Question 29

Cytokinins are transported through the xylem to meristems where they aid in cell elongation.