Question

Suggest an experiment to show how roots grow away from light in most plants.

Answer 1

"The simplest experiment to show how roots grow away from light is by keeping a plant in a jar in sunlight. You will observe that the stem grows towards light but the roots grow in downward direction.

Then place the plant in dark and you will observe that roots always grow downwards when they grow away from light. They are pulled towards gravity and thus they grow downwards. This is called positive geotropism.

"

Answer 2

The growth of plant roots away from light and (towards the earth) is called geotropism.

1. Take a potted plant growing in a transparent glass jar. When this potted plant is kept in a normal position, we can see that its roots are growing downwards and its stem is going upwards.

2. Let us now tilt the potted plant and keep the pot horizontally on its side. In this position,the roots and stem both are parellel to the ground (or earth). Allow the plant to remain in the position for a few days.

3. After a few days we will find that the roots of the potted plant bend downwards towards the Earth and the stem of the plant bends upwards, away from the earth.

4. The roots of plant grow downwards in response to the pull of gravity. the stem of plant response to gravity in the opposite way by growing upwards ( away from the pull of gravity).

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