Chapter 39 - Plant Responses to Internal and External Signals

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etiolation response

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Chemistry

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1

etiolation response

The ________ is one example of how intricate interactions between external and internal signals tailor a plant's morphology and physiology to its surroundings.

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2

hypersensitive reaction

The ________ isolates an infection and kills both pathogen and host cells in the area.

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3

Thigmotropism

________ is a touch- induced growth response.

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4

Plants

________ generate unpleasant or poisonous compounds, as well as attractants that draw herbivore- killing animals, in addition to physical defenses such as thorns and trichomes.

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5

Photoreceptors

________ that respond to blue light regulate hypocotyl elongation, stomatal opening, and phototropism.

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6

synthesis of chlorophyll

They are black, with enlarged leaves and short, strong stalks, but are not green because the final stage in the ________ necessitates direct exposure to light.

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7

Signals

________ are recognized initially by receptors, which are proteins that change form in response to a specific stimulus.

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8

Pathways

________ for signal transduction connect signal receipt to the response.

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9

Electrical impulses

________ are transmitted during rapid leaf motions.

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10

de etiolation

The kind of phytochrome that works in ________ is found in the cytoplasm, as opposed to most receptors, which are built into the plasma membrane.

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11

cellular reactions

The signal is sent, resulting in ________.

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12

resistance

Systemic acquired ________ is a broad- based defensive response in organs far from the source of infection.

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13

broad range of stimuli

Other than light, plants respond to a(n) ________.

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14

Dodder plants

________ receive particular environmental cues and respond to them in ways that improve survival and reproductive success, although dodder is not exceptional in this sense.

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15

Hormones

________ regulate plant growth and development by influencing cell division, elongation, and differentiation.

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16

short day plants

To blossom, ________ require a night that is longer than a crucial duration.

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17

intrinsic circadian clock

A(n) ________ regulates several daily cycles in plant activity.

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18

Positive gravitropism

________ is observed in the roots, whereas negative gravitropism is observed in the stems.

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19

Plants

________ are vulnerable to environmental stressors such as drought, floods, excessive salt, and temperature extremes.

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20

Plants

________ respond to diseases and herbivore assaults.

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