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Biology > Unit 12 > Flashcards

Unit 12 Flashcards

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1
Q

Stimuli

A

A change in the environment that causes a reaction by the organism

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2
Q

Plants grow…

A

Toward the light

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3
Q

Phototropism

A

Directional plant growth in response to light

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4
Q

Photo means…

A

Light

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5
Q

Tropism refers to…

A

Movement of the plant in response to the stimulus

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6
Q

Positive phototropism

A

Growth toward the light source

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7
Q

Negative phototropism

A

Growth away from the light source

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8
Q

The shoot system grows…

A

Toward the light

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9
Q

The root system grows…

A

Away from the light

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10
Q

Plant’s respond to…

A

Gravitational force

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11
Q

Gravitropism

A

Directional plant growth response to gravity: may be positive or negative; also called geotropism

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12
Q

Negative gravitropism

A

Growth away from the gravitational force; also called geotropism

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13
Q

Positive gravitropism

A

Growth toward the gravitational force

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14
Q

Geotropism

A

Directional plant growth response to gravity; may be positive or negative; also called gravitropism

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15
Q

Roots growing away from the light and in the same direction as gravity are more likely to find…

A

Minerals

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16
Q

Stems growing toward the light and against gravity will receive…

A

The energy required

17
Q

Control Systems

A

Systems within plants that produce definite responses to specific stimuli

18
Q

Charles darwin documented their findings in his book…

A

The power of movement in plants

19
Q

Peter boysen-jensen was trying to determine how…

A

The tip was communicating with the area of elongation

20
Q

Area of elongation

A

An area of cells in the developing plant facing away from the light source, that each elongate in a phototropic response to the light stimulus

21
Q

Boysen-jensen concluded…

A

That whatever was responsible for communicating stimulus information from the tip to the area of elongation was able to diffuse through the gelatin

22
Q

He suggested that the growth response could only be accomplished…

A

As a result of a chemical moving from the tip to the area of elongation

23
Q

Holland F.W went was able to isolate this chemical substance has indicated…

A

The later given name auxin

24
Q

Auxin

A

Type of plant hormone that promotes cell growth or elongation

25
Q

Hormone

A

Chemical compound that travels from its production site in an organism to other sites where it produces effect

26
Q

In low concentrations it has the ability…

A

To initiate a physiological response

27
Q

Plants rely on heavy starch particles in…

A

Specialized cells as indicators of gravity

28
Q

Phototropism and gravitropism have been…

A

Identified in plants

29
Q

Plants also respond to…

A

Temperature, chemicals, and water

Biology (19 decks)

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