Question

what materials do you required to observe tropic movements in stem tip and root tip​

Answer 1

Hydrogen peroxide is the material required to observe tropic movements in stem trip and root trip.

• The growth of the plant in tropic movements is towards or away from the stimulus.
• It allows the plants to adjust the direction of growth when their environment changes.
• Stems that emerge from seeds buried in the soil at right angles to gravity, such as an iris plant.
• On these research, to understand how to sense and differential growth takes place.

Answer 2

The correct answer is: Sunlight.

Explanation:

• Tropic movements can be defined as the movement shown in plants in response to certain stimuli. The direction of the movement is dependent on the direction of the stimuli.
• Shoot tip tends to move (bend) towards sunlight.
• Root tip tends to move (bend) away from sunlight.
• This movement is shown due to a plant hormone: Auxin.
• Auxin is a hormone which primarily promotes cell elongation.
• Auxin promotes cell growth in shoot while it inhibits cell growth in root.
• But auxin is sensitive to light and hence its gets degraded in presence of light.
• In the shoot tip, auxin deposits in that side of the stem that is away from light, causing it to elongate more than the other side. This causes bending of the shoot towards the light.
• In the root tip, auxin deposits in that side of the root that is away from light, causing it to elongate less than the other side. This causes the root to bend in the direction opposite to that of light.