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Phototropism

Phototropism. Starter : The circle on the board represents the Earth. Come up and draw a plant growing somewhere on the Earth. What is phototropism and how does it help plants survive?. Learning Outcomes. E xplain how phototropism increases a plant’s chances of survival

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Phototropism

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  1. Phototropism Starter: The circle on the board represents the Earth. Come up and draw a plant growing somewhere on the Earth. What is phototropism and how does it help plants survive?

  2. Learning Outcomes Explain how phototropism increases a plant’s chances of survival Describe how plant shoots grow towards a light source H: explain phototropism in terms of the redistribution of auxin in shoot tips

  3. Call my Bluff • Phototropism –

  4. Call my Bluff • Phototropism – the movement of a plant in response to light. • Phototropism – a professional picture of a plant. • Phototropism – A 17 sided shape, mimicked in nature by some seeds.

  5. Key words Tropism: responding to a stimulus by growing towards it or away from it. Phototropism: the movement of a plant in response to light. Auxins: Plant hormones

  6. MRS GREN What are the 7 signs of life?

  7. Sensitivity

  8. Think – Pair – Share How are animals sensitive to the environment? How do they respond to the environment?

  9. Animal Sensitivity

  10. Plants

  11. Plants are sensitive to.. • Light • Gravity • Moisture • What has happened to this plant? How is that an advantage?

  12. Video time • Phototropism

  13. Direction of growth The shoot grows: • Towards the light • Away from gravity The root grows: • Away from light • Towards gravity • Towards moisture

  14. phototropism Phototropism animation

  15. Auxins are hormones made by the shoot tip, that control how plants respond to sunlight. They make the cells on one side of the plant grow longer so that the shoot bends towards the light. Key word: Elongation

  16. In small groups On A3 paper draw what you think a stem would look like in the following situations. • With light to the right. • With light to the left • With light up above. • With light to the right by no stem tip.

  17. Task • Complete the worksheet showing the directions plants move and the position of auxins.

  18. Plenary • Make a revision card with the key points about phototropism.

  19. We are going to set up an experiment today to look at the way position of light affects the direction of growth of plants. Method Collect 3 petri dishes and line them with growing medium. Water the growing medium. Place 6 seeds in each dish. Collect a coloured lamp and set it up on the bench. Place the seeds 20cm away from the lamp and place a box over the experiment.

  20. Questions What are we changing about the experiment? (What are we testing?) 2. What are we going to measure and take results of? 3. What do we want to keep the same so we don’t affect the results? 4. What do you think will happen in the experiment?

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