5.4 Plant Hormones Flashcards Preview

A Level Biology > 5.4 Plant Hormones > Flashcards

Flashcards in 5.4 Plant Hormones Deck (23)
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1
Q

(Ripening) which hormone is involved in the ripening of climacteric fruit?

A

Ethene

2
Q

(Ripening) ripening is linked to a peak of ethene production triggering increased what?

A

Respiration and other reactions

3
Q

(Ripening) what type of fruits are climacteric?

A

Bananas, tomatoes

They continue to ripen after harvesting

4
Q

(Ripening) ethene is used in production of climacteric fruit for who?

A

Grocers and supermarkets

5
Q

(Ripening) fruits are harvested before ripe they are then what?

A

Cooled
Stored
Transported

6
Q

(Ripening) when needed for sale plants are exposed to ethene ensuring what?

A

Each fruit ripens at the same time ready for sale

7
Q

(Ripening) using ethene in this way has what benefits?

A

Increases time to be sold

Prevents waste during transport

8
Q

(Ripening) if part of a bunch of green bananas are placed in a bag with a ripe banana and the other part without what will happen?

A

Bunch with the ripe banana will ripen faster due to ethene from the ripe one stimulating ripening

9
Q

(Hormonal weedkillers) what are weeds?

A

Plants growing where they aren’t wanted

They can interfere with crop plants by competition

10
Q

(Hormonal weedkillers) scientists have developed what that acts as weedkillers?

A

Synthetic auxins

11
Q

(Hormonal weedkillers) many crops are what type of plants?

A

Narrow leaves monocots

12
Q

(Hormonal weedkillers) most weeds are what type of plants?

A

Broad leaves dicots

13
Q

(Hormonal weedkillers) synthetic dicot auxins are applied as weed killer and are absorbed by what?

A

Broad leaves plants increasing growth rate so it is so unsustainable they die

14
Q

(Hormonal weedkillers) narrow leaved crops continue to do what?

A

Grow normally

15
Q

(Hormonal weedkillers) what benefits are there if synthetic auxins?

A

Simple and cheap to produce

Low in toxicity to animals

16
Q

(Other uses) what hormones can be used in the production of seedless fruit?

A

Auxins

17
Q

(Other uses) what hormone is used to promote fruit dropping in plants?

A

Ethene

18
Q

(Other uses) cytokinins can be used to prevent what?

A

Ageing in ripening fruit

19
Q

(Other uses) gibberellins can be used to do what?

A

Delay ripening and ageing
Improve size and shape of fruit
Speed up melting process in beer brewing

20
Q

(Hormone roofing powders) application of auxins to cut shoots stimulates what? And what does this help do?

A

Roots

Making it easier to propagate new plants from cuttings

21
Q

(Hormone roofing powders) dipping plants into hormone roofing powder increased chances of what?

A

Roots forming

22
Q

(Hormone roofing powders)many plants are grown by micropropagation what is this?

A

Producing thousands of new plants from a few cells of the original

23
Q

(Hormone roofing powders)plant hormones control production of the what?

A

Mass of new cells

Differentiation of clones into new plants

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