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Auxins are plant hormones.

*  Fruit ripening is one use of plant hormones.

Describe the other uses of plant hormones in crop production (6)

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* Reforestation has a beneficial effect on air composition and biodiversity.

Animal conservation projects can also have a beneficial effect on biodiversity.

Explain the beneficial effects of reforestation and animal conservation projects. (6)

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* Explain how substances are moved through a plant by transpiration and translocation. (6)

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* Marram grass is a plant that grows on exposed areas of sand dunes.

Figure 19 shows marram grass growing and a cross section through a leaf of marram grass.

Explain how marram grass is adapted to survive in the hot, windy and dry conditions of a sand dune. (6)

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* Figure 15 shows a pot plant before it fell over and the same pot plant two weeks after it fell over.

Explain how hormones in the roots and shoots of plants caused this directional growth. (6)