B3.2.7 - Uses Of Plant Hormones Flashcards

1
Q

What plant hormone does banana give off?

A

Ethene gas

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2
Q

How are plant hormones produced and transported?

A

They are produced by cells in one area of the plant and then transported to a different area to produce a response

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3
Q

Describe the main functions of auxins.

A

They stimulate growth by causing cell elongation and they also help to regulate fruit development. Without auxins, fruits are often too small.

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4
Q

Describe the main functions of ethene.

A

They cause plant fruits to ripen by stimulating the conversion of starch into sugar. It is the only plant hormones that exists as a gas

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5
Q

Describe the main functions of gibberellins.

A

They promote growth, particularly stem elongation. They can also end the dormancy period of seeds and buds, which leads to shoots and flowers opening.

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6
Q

What are some commercial uses of plant hormones?

A

Speeding up or slowing down plant growth.

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7
Q

What do many weed killers contain?

A

Auxins

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8
Q

What are weed killers?

A

Selective herbicides which kill weeds that are broad-leaved plants but do not affect narrow-leaved plants.

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9
Q

How does the auxin weedkiller kill weeds?

A

It makes the weeds grow too fast, and the rapid uncontrolled growth kills the plant

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10
Q

What does rooting powder contain?

A

Auxins

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11
Q

What do horticulturists and gardeners use auxin for?

A

Producing identical plants

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12
Q

How are identical plants produced?

A

The plant shoot is cut off, dipped into rooting powder and planted.

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13
Q

How is ripening delayed?

A

Auxin is sprayed onto fruit trees

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14
Q

Why is ripening delayed/

A

So a harvest can be collected all at the same time and fruit won’t drop off trees early

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15
Q

How is ripening quickened?

A

Ethene is sprayed onto fruit trees and plants

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16
Q

Why is ripening quickened?

A

So that fruits can be ready earlier in the growing season

17
Q

How can you produce seedless fruit?

A

Use auxin on unpollinated flowers

18
Q

Why is seedless fruit produced?

A

People like fruits without seeds

19
Q

Why do seeds not normally germinate at the end of summer?

A

So that they can survive the winter

20
Q

How do commercial growers trigger seeds to germinate in the winter?

A

Spraying them with gibberellins or auxin in a greenhouse