Question

what materials do you require to observe tropic movement in stem tip and root tip ​

Answer 1

Hydrogen peroxide is a material that is used to observe the responses by  root tropic and shoot tropic.

Explanation:

Tropic movement:

It is defined as the movement of plant towards a stimuli source. Towards stimuli source it can be towards the direction of stimuli or away from stimuli.

The types of stimuli are

• Photo-tropism-movement towards light e.g. sunflower
• Hydro-tropism
• Thigmo-tropism
• Chemo-tropism

Hydrogen peroxide is a material that is used to observe the responses by  root tropic. It acts as positive regulators of gravi-tropism and as negative regulators of hydro-tropism.

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What are parts of plants?

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Answer 2

The correct answer is to the question is: Sunlight.

Explanation:

• Tropic movements are defined as the plant movements with respect to certain stimuli. The movement's direction is dependent on the stimuli's direction.
• Shoot tip have a tendency to bend towards the sunlight.
• Root tip have a tendency to bend away from the sunlight.
• This plant hormone called Auxin promotes this movement.
• Auxin is responsible for cell elongation.
• In shoot, auxin promotes cell elongation.
• In root , auxin inhibits cell elongation.
• Being light-sensitive, auxin gets degraded in presence of light.
• Auxin tends to deposit in that side of the shoot tip that remains unexposed to light, causing it to elongate more than the side exposed to light. Hence, the shoot tip bends towards the light's direction.
• Auxin tends to deposit in that side of the root tip that remains unexposed to light, causing it to elongate less than the side exposed to light. Hence, the root tip bends away from the light direction.