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KS4 Plant Hormones Learning Objectives
5.4.1 Control and coordination
Students should:
- Know that plants produce hormones to coordinate and control growth and responses: to light, phototropism; and gravity, gravitropism (geotropism).
- Know that unequal distributions of auxin cause unequal growth rates in plant roots and shoots.
- Know that gibberellins are important in initiating seed germination. (HT only)
- Know that ethene controls cell division and ripening of fruits. (HT only)
(NB: the mechanisms of how gibberellins and ethene work are not required.)
5.4.2 Use of plant hormones
Students should:
- Know that plant growth hormones are used in agriculture and horticulture.
- Know how the everyday use of hormones as weedkillers has an effect on biodiversity.
- Auxins are used as:
- as weed killers
- as rooting powders
- for promoting growth in tissue culture.
- Know that ethene is used in the food industry to control ripening of fruit during storage and transport.
- Know that gibberellins can be used to:
- end seed dormancy
- promote flowering
- increase fruit size
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