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प्रश्न
How is the movement of leaves of the sensitive plant different from the movement of a shoot towards light?
उत्तर १
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.
उत्तर २
The movement of leaves of the sensitive plant, Mimosa pudica or “touch me not”, occurs in response to touch or contact stimuli. This is done by plant cells by changing the amount of water in leaves. This movement is independent of growth. The movement of shoot towards light is known as phototropism. This type of movement is directional and is growth dependent.
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संबंधित प्रश्न
Name the type of chemical substances that control the growth in plants.
What is the stimulus in phototropism?
Plant parts show two types of movements, one dependent on growth and other independent of growth. Give one example which does not depend on growth
Name the plant part which bends towards light but away from the force of gravity.
The response of leaves to the sunlight is called ______.
Why is the closing of a dandelion flower at dusk (when it gets dark) not a tropism?
Define hydrotropism. Give one example of hydrotropism. State whether this example is of positive hydrotropism or negative hydrotropism. Illustrate your answer with the help of labelled diagram.
Define thigmotropism. Give one example of thigmotropism.
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?
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:
When the leaves of a sensitive plant are touched with a finger, they fold up and when light fades at dusk, the petals of a dandelion flower close.
state two ways in which the above two processes differ.
Differentiate between:
Phototropism and chemotropism
The response of plants to gravity is known as geotropism. How are plant parts sensitive to gravity? Describe with the help of a diagram.
What is chlorophyll?
Higher Order Thinking Skill.
There are 3 plants A, B and C. The flowers of A open their petals in bright light during the day but closes when it gets dark at night. On the other hand, the flowers of plant B open their petals at night but closes during the day when there is bright light. The leaves of plant C fold up and droop when touched with fingers or any other solid object.
- Name the phenomenon shown by the flowers of plant A and B.
- Name one plant each which behaves like the flowers of plant A and B.
- Name the phenomenon exhibited by the leaves of plant C.
- Name the plant which behaves like the leaves of plant 'C'?
Thigmonasty can be seen in ______.
______ flowers bloom as the temperature increases.
Chlorophyll differs from hemoglobin by the presence of its central molecule ______.
Plants exchange gases ______ continuously through these stomata.
