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Biology > Chapter 25 > Flashcards

Chapter 25 Flashcards

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AP® Biology flashcards Biology 101 flashcards
0
Q

The portion of an organism affected by a particular hormone

A

Target cell

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1
Q

A substance that is produced in one part of an organism and affects another

A

Hormone

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2
Q

Tendency of a plant to grow toward a source of light

A

Phototropism

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3
Q

Regulates cell growth and stimulates cell elongation

A

Auxins

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4
Q

Response of a plant to the force of gravity

A

Gravitropism

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5
Q

Causes gravitropism

A

Auxins

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6
Q

Meristematic area on a side of a stem that gives rise to side branches

A

Lateral bud

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7
Q

The closer a cell is to the stems tip, the more inhibited it is

A

Apical dominance

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8
Q

Compounds that are toxic to plants

A

Herbicides

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9
Q

Plant hormones that are produced in growing roots and in developing roots and seeds

A

Cytokinins

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10
Q

Growth promoting substance

A

Gibberellin

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11
Q

One of the minor components of natural gas

A

Ethylene

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12
Q

Responses of a plant to external stimuli

A

Tropisms

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13
Q

Response of a plant to touch

A

Thigmotropism

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14
Q

Flower when days are short

A

Short day plants

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15
Q

Flower when days are long

A

Long day plants

16
Q

Chrysanthemums and poinsettias

A

Short day plants

17
Q

Spinach and irises

A

Long day plants

18
Q

Plants response to periods of light and darkness

A

Photoperiodism

19
Q

Pigment responsible for photoperiodism

A

Phytochrome

20
Q

Seals the leaf off from its vascular system

A

Abscission layer

21
Q

Plants that live in the desert biome

A

Xerophytes

22
Q

Plants that are not rooted in the soil but instead grow directly on the bodies of other plants

A

Epiphytes

23
Q

Produced in the apical meristem

A

Auxins

24
Q

Produced in growing roots

A

Cytokinins

25
Q

Stimulates fruit to ripen

A

Ethylene

26
Q

Stimulate the growth of lateral buds

A

Cytokinins

27
Q

Produce dramatic increases in size

A

Gibberellins

28
Q

Cause dormant seeds to sprout

A

Cytokinins

29
Q

Promotes root growth

A

Auxins

30
Q

Promotes cell division

A

Cytokinins

Biology (9 decks)

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