International Young Naturalist’s Tournament

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Presentation transcript:

International Young Naturalist’s Tournament IYNT 2016 Iran-Shiraz International Young Naturalist’s Tournament

Problem No.7. Reporter: Zeinab Ammari Allahyari Maple group

7. Plants in Motion Various plants can turn in response to the position of the sun or other light sources. Investigate this motion experimentally and theoretically.

Grows out Grows up Grow down International Young Naturalist’s Tournament | 08/2016 | page 1 `

What’s tropisms? International Young Naturalist’s Tournament | 08/2016 | page 2 `

What’s phototropism? Phototropism is a curvature in relation to directional light. International Young Naturalist’s Tournament | 08/2016 | page 3 `

positive phototropism negative phototropism International Young Naturalist’s Tournament | 08/2016 | page 4 `

positive phototropism negative phototropism International Young Naturalist’s Tournament | 08/2016 | page 5 `

Experiment No.1: positive phototropism International Young Naturalist’s Tournament | 08/2016 | page 6 `

Step1: 1 2 3 International Young Naturalist’s Tournament | 08/2016 | page 7 `

Step2: Days No.1-5 Days No.5-10 International Young Naturalist’s Tournament | 08/2016 | page 8 `

Step3: Days No.1-5 Days No.5-10 International Young Naturalist’s Tournament | 08/2016 | page 9 `

How can they turn like this? International Young Naturalist’s Tournament | 08/2016 | page 10 `

International Young Naturalist’s Tournament | 08/2016 | page 11 `

International Young Naturalist’s Tournament | 08/2016 | page 12 `

Frits Went’s experiment: A Dutch graduate student named Frits Went first described auxins in 1926 and chose the name auxin from the Greek word auxien, which means 'to grow. International Young Naturalist’s Tournament | 08/2016 | page 13 `

International Young Naturalist’s Tournament | 08/2016 | page 14 `

Sources: www.emaze.com www.uky.edu www.sciencepresse.qc.ca www.sinauer.com www.whfreeman.com www.pitara.com www.plantphys.info www.slideplayer.com International Young Naturalist’s Tournament | 08/2016 | page 15 `

The end, Thanks for your attention!

Charles Darwin’s experiment: Charles Darwin and his son Francis studied the familiar reaction of plants growing toward light.