Question

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Write a activity on " To demonstrate phototropism in plants."

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Answer 1

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Activity

Objective:-

To demonstrate phototropism in plants.

Matterials and Apparatus:-

Small disposable plastic cups, seeds of gram or moong, garden soil, an empty cardboard box like a shoe box.

Procedure:-

1. Soak some seeds of gram / moong in water for one day.
2. Pierse a few small holes at the bottom of the disposable plastic cup for drainage of excess water.
3. Fill in the cup three fourths with soil.
4. Put some soaked seeds on the soil and cover them by sprinkling a little soil over them.
5. Water the seeds.
6. Put the cup in a shoe box in which a hole of 2 cm diameter has been made on one side. Cover the box with the lid.
7. Put the box in a window or a place where light can fall on the box.
8. Open the box after a week.
9. Observe the growing seedlings.

Observe and Conclusion :-

The shoots of the seedlings are all bent towards the hole in search of light. That is because the shoot grows towards light and exhibits phototropism.

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Answer 2

Answer:

✯The directional movement of a plant in response to light is called phototropism. ...

✯ When sunlight fells on only one side of the plant, the auxin diffuses towards the shady side of shoot.

✯ The concentration of auxin stimulates the cells to grow longer. Therefore, the stem appears to bend towards the source of light.