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Biology > Plant Hormones > Flashcards

Plant Hormones Flashcards

1
Q

What tropisms do plant shoots experience?

A

Positive phototropism

Negative geotropism/gravitropism

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2
Q

What tropisms do plant roots experience?

A

Negative phototropism
Positive geotropism/gravitropism
Positive hydrotropism

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3
Q

What is a tropism?

A

A directional growth response

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4
Q

What is a plant’s response to light?

A

Phototropism

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5
Q

What is a plant’s response to gravity?

A

Geotropism/gravitropism

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6
Q

What is a plant’s response to moisture?

A

Hydrotropism

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7
Q

How do plant hormones travel?

A

From cell to cell

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8
Q

How do plants use hormones to make adjustments to survive?

A

Plant hormones are sensitive to their environment

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9
Q

Why does a plant’s shoots need to grow upwards?

A

To receive light to break the bonds in water during photosynthesis
To receive carbon dioxide for photosynthesis
To lose water through transpiration

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10
Q

Why does a plant’s roots need to grow downwards?

A

To receive water for photosynthesis
To anchor the plant in the soil
To reach minerals

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11
Q

How do hormones contribute to a plant’s response to stimuli?

A

They are distributed unequally, causing unequal growth rates

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12
Q

What are auxins?

A

Plant hormones

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13
Q

What do auxins control?

A

Cell elongation

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14
Q

What do auxins do in the shoots of plants?

A

Make cells elongate

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15
Q

What do auxins do in the roots of plants?

A

Inhibit cell growth

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16
Q

How do auxins move in accordance to light?

A

They move away from light

17
Q

How do auxins move in accordance to gravity?

A

They move towards gravity

18
Q

What is ethene?

A

A plant hormone

19
Q

What does ethene do?

A

Causes fruit to ripen

20
Q

How does ethene cause fruit to ripen?

A

By stimulating the conversion of starch into sugar

21
Q

What state is ethene in?

A

A gas

22
Q

What are gibberellins?

A

A plant hormone

23
Q

What do gibberellins do?

A

End the dormancy period of seeds and buds, meaning flowers open and seeds germinate
Promote growth and development

24
Q

How are auxins used as weedkillers?

A

They make the weed grow too quickly, resulting in it dying

25
Q

What is a use of ethene?

A

Ripen fruit

26
Q

How is are auxins used to produce parthenocarpic fruit?

A

By subjecting the plant to auxins in early ovule development, resulting in the production of fruit without the fertilisation of the ovules to create seedless fruit?

27
Q

What is parthenocarpic fruit?

A

Seedless fruit

28
Q

How are gibberellins used?

A

To grow seeds all year round

Biology (5 decks)

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