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Biology > Plant Response > Flashcards

Plant Response Flashcards

1
Q

Response

A

A reaction in an organism as a result of a stimulus

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2
Q

Structures necessary for a plant response

A

Hormonal system - plant + animal
Nervous system - animal
Immune system

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3
Q

Hormone

A

A chemical produced in one part of an organism and transported to another part where it has its effect

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4
Q

External stimuli

A 
Light intensity
Day length
Gravity
Temperature 
Water
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5
Q

Internal stimuli

A

Growth regulators - chemicals

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6
Q

Tropism

A

Growth tendency of a plant in response to an external stimulus

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7
Q

Types of Tropism

A 
Phototropism
Geotropism
Hydrotropism
Thigmotropism
Chemotropism
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8
Q

Phototropism

A

Growth tendency of a plant in response to light
Shoots - positive
Roots - mainly negative

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9
Q

Geotropism

A

Growth tendency of a plant in response to gravity
Roots - positive
Shoots - negative

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10
Q

Thigmotropism

A

Growth tendency of a plant in response to touch

Climbing plants

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11
Q

Hydrotropism

A

Growth tendency of a plant in response to water

Roots and pollen tubes - positive

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12
Q

Chemotropism

A

Growth tendency of a plant in response to chemicals

Pollen tubes - positive to ovule

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13
Q

Growth regulators

A

A chemical which controls the growth of a plant
Produced at the tip of the meristem
Transport to the zone of elongation in phloem and xylem
Promotes root growth at high concentration
Active in small amounts

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14
Q

Growth promoter

A

Auxins - IAA

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15
Q

Growth inhibitor

A

Abcistic acid or ethene

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16
Q

Stimulation

A

Any change in the environment which causes a response in an organism

17
Q

Mechanisms of Phototropism

A

Causes more auxin to diffuse to shaded side
More growth on shaded side
Plant bends towards light
Plant shoot and leaves in a favorable position for maximum light and maximum photosynthesis

18
Q

Mechanisms of Geotropism

A

IAA causes root growth at low concentration
Gravity causes more IAA to be collected at lower side of the root
Root grows towards gravity
Roots are in a favorable position to absorb water and minera

19
Q

Commercial growth regulators

A

NAA AND IBA: commercial roofing powders to stimulate root growth
Gibberellins: increase the size of fruit
Ethene: ripening agent for food

20
Q

Anatomical plant adaptations for protection

A 
Bark to protect trees
Thorns
Spines
Stinging hairs /needles
Waxy cuticles on leaves
21
Q

Chemical plant adaptations for protection

A

Corn lily is poisonous

Poison Ivy produces a chemical to protect the plant from herbivores

22
Q

Where is Auxin produced

A

Meristematic tissue

23
Q

Inhibitory function of auxin

A

Apical dominance

Biology (38 decks)

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