Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. (Separates only) What are the hormonal responses in plants to light and gravity called?
   • Plants produce hormones to coordinate and control growth and responses to light (phototropism) and gravity (gravitropism or geotropism).
2. (Separates only) What causes the unequal growth rates in shoots and roots that means plants can grow in specific directions?
   • Unequal distributions of auxin cause unequal growth rates in plant roots and shoots
3. (HT) What role does Gibberellins have in a plant?
   • (HT) Gibberellins are important in initiating seed germination.
4. (HT) What role does Ethene have in a plant?
   • (HT) Ethene controls Cell division and ripening of fruits.
5. (Separates only) Give some uses of plant hormones that can be used to control plant growth
   • selective weedkillers, rooting powders (auxins), seedless fruits.
6. (Separates only) What are plant hormones used by people in?
   • Plant growth hormones are used in agriculture and horticulture
7. (Separates only) What negative effect can the use of hormones as weed killers have?
   • Everyday use of hormones as weed killers has an effect on biodiversity.
8. (Separates only) How do people use auxins?
   • Auxins are used: ? as weed killers ? as rooting powders ? for promoting growth in tissue culture.
9. (Separates only) How do people use ethene?
   • Ethene is used in the food industry to control ripening of fruit during storage and transport.
10. (Separates only) How do people use Gibberellins?
    • Gibberellins can be used to end seed dormancy, promote flowering and increase fruit size.