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प्रश्न
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.
उत्तर
The first process of folding up of leaf is thigmonastic and the stimulus is touch. The second process of closing of petals is photonastic and the stimulus is light.
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संबंधित प्रश्न
How do auxins promote the growth of a tendril around a support?
Name the type of chemical substances that control the growth in plants.
What are the different types of tropisms? Define each type of tropism. Write the name of stimulus in each case
How does phototropism occur in a plant stem (or shoot)? Explain with the help of labelled diagrams.
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.
The climbing organs of plants like tendrils grow towards any support which they happen to touch and wind around the support. This is an example of :
(a) chemotropism
(b) nastic movement
(c) thigmotropism
(d) geotropism
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 one way in which the above two processes are similar.
The opening and closing of the Moonflower is not a tropism because the movement in this is ______.
Plants exchange gases ______ continuously through these stomata.
Some plants like pea plants have tendrils which help them to climb up other plants. Explain how is it done. Name the plant hormone responsible for this movement.
