Advertisements
Advertisements
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
What is the stimulus in phototropism?
What is the stimulus in geotropism?
Give the scientific terms used to represent the Bending of a shoot towards light.
What happens to the dandelion flower
- during the daytime, and
- at night?
What is this phenomenon known as?
What is a tendril?
Name the two types of tendrils.
Name the plant organ which is positively geotropic
One of the following is not caused by the growth related movement of the concerned plant part. This is:
Differentiate between:
Phototropism and chemotropism
Match column A with column B.
| Column A | Column B |
| Roots growing downwards into soil. | Positive phototropism |
| Shoots growing towards the light. | Negative geotropism |
| Shoots growing upward. | Negative phototropism |
| Roots growing downwards away from light. | Positive geotropism |
State whether true or false. If false, correct the statement.
The response of a part of plant to the chemical stimulus is called phototropism.
Differentiate phototropism from photonasty.
What is the difference between movement of flower in sunflower plant and closing of the leaves in the Mimosa pudica?
A student accidentally places her hand on the flame of the candle and quickly pulls her hand away. The flame represents:
The stimulus in the process of thigmotropism is:
The plant part which exhibits negative geotropism is ______.
______ flowers bloom as the temperature increases.
Where are auxins synthesized in a plant? Which organ of the plant shows:
- Positive phototropism
- Negative geotropism
- Positive hydrotropism
The instrument which can be used to demonstrate geotropism is ______.
