Starter quiz
- True or false? Plants have hormones.
- True ✓
- False
- Plant hormones that control a plants' response to a stimulus are called...
- 'Auxins' ✓
- What is the term given to the growth response of a plant to a stimulus?
- tropism ✓
- auxin
- germination
- fertilisation
- pollination
-
True or false? Fruits are a seed.- True
- False ✓
What does a seed contain?- formed roots
- food store (endosperm) ✓
- seed coat ✓
- embryo ✓
- egg
-
What triggers germination?- carbon dioxide
- water ✓
- optimal temperature ✓
- nutrients
- oxygen ✓
-
Exit quiz
______ is a gas naturally produced by fruit that activates fruit ripening.- 'ethene' ✓
- What is the role of gibberellins?
- selective weed killers
- increase fruit size ✓
- promote flowering ✓
- control growth towards a stimulus e.g. light
- stimulate germination ✓
-
- What are the advantages of using ethene in transit?
- it increases profits for the farmer ✓
- it reduces the amount of fruit that is spoiled or over ripened ✓
- it prevents ripening
- ethene makes fruits firmer and less likely to be damaged
-
- Why would a plant breeder apply artificial gibberellins to their plants?
- to speed up fruit ripening in transit
- to encourage root growth as a rooting powder
- to force plants to produce flowers ✓
- to increase the size of the fruit they produce ✓
-
A banana is over-ripe and has caused the other fruit in the fruit bowl to ripen. Which plant hormone was the banana producing to cause this?- 'ethene' ✓
- A farmer would like to produce seedless fruit. Which plant hormone would the farmer apply to their crop?
- 'gibberellin' ✓
Worksheet
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Video
Lesson Details
Key learning points
- Gibberellins are plant hormones that cause plants to produce flowers and cause seeds to germinate.
- Plant breeders use gibberellins to force plants to produce flowers so they can be pollinated and increase size of fruit.
- Ethene is a plant hormone that causes ripening of fruit.
- Commercial fruit growers use ethene to speed up fruit ripening so that fruit is ready for sale.
Common misconception
Fruit can only ripen whilst it is on the plant.
Discussion of fruits that are picked unripe, e.g. nectarines, tomatoes, avocados, bananas, and that they are ripened in transit.
Keywords
Gibberellins - A plant hormone involved in many processes in growth and development, including germination.
Ethene - A gas naturally produced by a plant to activate fruit ripening.
Ripening - The process of a fruit changing to be ready to be eaten.
Germination - The process of seeds developing into new plants.
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