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प्रश्न
What is meant by positive and negative tropic movements in plants? Explain them by giving suitable examples.
उत्तर
Positive tropic movements in plants:
Directional movement of a plant part towards the stimulus is called positive tropic movement.
Examples:
- Growth of shoots towards light
- Growth of roots towards gravity
- Growth of roots towards water
Negative tropic movements in plants:
Directional movement of a plant part away from the stimulus is called negative tropic movement.
Examples:
- Growth of roots away from light
- Growth of shoots upwards and away from gravity
- Growth of shoots away from water
APPEARS IN
संबंधित प्रश्न
Name one example of the movement of a plant part which is very quick and can be observed easily.
The root of a plant grows downward. This is known as ______.
Name the plant organ which is positively phototropic.
Dandelion flowers open the petals in bright light during the daytime but close the petals in dark at night. This response of dandelion flowers to light is called:
A growing seedling is kept in the dark room. A burning candle is placed near it for a few days. The tip part of the seedling bends towards the burning candle. This is an example of ______.
Any change in the environment to which an organism responds is called ____________.
Assertion: Plants do have a nervous system for control and coordination.
Reason: Plants use electrochemical means to convey information from cell to cell.
Thigmonasty can be seen in ______.
Name a hormone which is responsible for phototropism
Define the following term:
Tropism
