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प्रश्न
Define the following term:
Heliotropism
उत्तर
Heliotrophy is a tropism in which plants demonstrate directional growth or movement in response to the sun's position. As sunflowers follow the sun's path throughout the day, they are a prime illustration of heliotropism.
संबंधित प्रश्न
How do auxins promote the growth of a tendril around a support?
Design an experiment to demonstrate hydrotropism.
What is the stimulus in thigmotropism?
What is meant by ‘positive geotropism’ and ‘negative geotropism’? Give one example of each type. Draw a labelled diagram to illustrate your answer, indicating the plant part, which shows positive geotropism, and the plant part, which shows negative geotropism.
Name five stimuli which act on plants. Name the type of tropism produced by each one of these stimuli.
What is meant by positive tropism and negative tropism? Explain with examples.
The plant part which exhibits negative geotropism is :
(a) root
(b) stem
(c) branch
(d) leaves
A potted plant having straight parts A and B was placed horizontally on its side as shown in Figure (i). After a few days, it was observed that parts A and B of the plant acquired new positions as shown in Figure (ii).
- Name the phenomenon exhibited by the position of plant parts A and B in Figure (ii).
- Name the stimulus (other than sunlight) which causes plant part A to grow and bend upwards, and plant part B to bend downwards.
Give an example for the movement of plant part which is very quick and can be observed easily.
Differentiate between:
Positive and negative tropism
