What is phototropism and how does it help plants survive?

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Look at the following pictures and describe what types of tropism you see. Are they positive or negative?

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© Copyright The PiXL Club Ltd, 2016

© Copyright The PiXL Club Ltd, 2016

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Presentation transcript:

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

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

Call my Bluff Phototropism –

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.

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

MRS GREN What are the 7 signs of life?

Sensitivity

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

Animal Sensitivity

Plants

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

Video time Phototropism

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

Phototropism animation

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

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.

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

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

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.

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?