Question

please answer fast .​

Answer 1

Answer:

1) Any of various hormones produced by plants that control or regulate germination, growth, metabolism, or other physiological activities. Auxins, cytokinins, gibberellins, and abscisic acid are examples of plant hormones. Also called phytohormone.

2) The movements of the leaves of the sensitive plant are touch sensitive and independent of growth. While the movement of the shoot towards light is growth related and known as phototropism.

3) Auxin is an example of plant hormone which promotes the growth of the plant.

4) Auxins are the plant hormone which is synthesized at the shoot tip. It helps the cells to grow at the root tips. When a tendril comes in contact with a support, auxin stimulates faster growth of the cells on the opposite side, as a result of the tendrils coil around the support.

Answer 2

1》Plant hormones are organic substances produced naturally in higher plants. They control growth and other physiological functions of the plants this are required in very small amounts.

2》 Differences between movement of leaves and movement of shoot towards light are as follows :

Movement of Leaves ( Sensitive plants ) :

1. This movement is independent of growth.
2. Stimulus is touch.
3. Movement is not directional.
4. Movement is neither away nor towards the stimulus.

Movement of shoot :

1. This movement is dependent on growth.
2. Stimulus is light.
3. Movement is directional.
4. Movement is towards the stimulus.

3》Auxin is a plant hormone which promotes growth in the plants.

4》Auxins promote cell elongation and are present at the shoot tip. When tendril comes in contact with the support, oxygen stimulates faster growth of the cells on the opposite sides. Thus, the tendril coils around a support.

5》The growth of the plant parts towards or away from water is called hydrotropism it is shown in the diagram given above.

To perform the experiment, take a pea seedling in a jar filled with sand .

Place a porous pot filled with water in the wide jar.

Roots of the plant will grow towards water and bend towards the water source showing positive hydrotropism.