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प्रश्न
How does phototropism occur in plants?
उत्तर
The growth movement in plants in response to light stimulus is known as phototropism. The shoots show positive phototropism and the roots show negative phototropism. This means that the shoots bend towards the source of light whereas the roots bend away from the light source.
For Example: The flower head of a sunflower is positively phototropic and hence it moves from east to west along with the sun.
संबंधित प्रश्न
Give the scientific terms used to represent the Bending of a shoot towards light.
What does a root do in response to gravity? What is this phenomenon known as?
The root of a plant grows downward. This is known as ______.
Fill in the following blank :
...... is the hormone that causes phototropism in plants
A potted plant is kept horizontally for a considerable time. The three positions of the parts A and B of the potted plant are shown in the following figures:
- Which figure shows the correct position taken by the parts A and B of the plant?
- What type of phenomenon is exhibited by the figure chosen in (a) above?
What is the difference between thigmotropism and thigmonasty? Name one plant which exhibits thigmotropism and one plant which exhibits thigmonasty. What behaviour (or responses) of these plants make you think that they exhibit thigmotropism and thigmonasty respectively?
Which of the following is not caused by a growth movement?
The bending of the shoot of a plant in response to light is called :
(a) geotropism
(b) phototropism
(c) thigmotropism
(d) photonasty
The bending of root of a plant in response to water is called ______.
The shoot system grows upward in response to ______.
State whether true or false. If false, correct the statement.
Shoot is positively phototropic and negatively geotropic.
The growth of pollen tubes towards ovules is due to
The plant part which exhibits negative geotropism is ______.
______ flowers bloom as the temperature increases.
Which flowering plant shows a photo nasty just opposite to that of a Dandelion?
Where are auxins synthesized in a plant? Which organ of the plant shows:
- Positive phototropism
- Negative geotropism
- Positive hydrotropism
The height of a plant is regulated by ______.
Arrange and rewrite the terms in the group in the correct order so as to be in a logical sequence, beginning with the term that is underlined.
Apical meristem, Positive phototropism, Auxins, Cell elongation.
