Advertisements
Advertisements
Question
What is meant by positive phototropism and negative phototropism? Give one example of each type.
Solution
The movement of plant parts towards the light source is known as positive phototropism, whereas the movement of plant parts away from light is known as negative phototropism. The stems of plants show positive phototropism as they grow upwards. The roots of plants show negative phototropism as they grow downwards into the soil.
APPEARS IN
RELATED QUESTIONS
Name one plant part which exhibits positive thigmotropism.
One of the following is not caused by the growth related movement of the concerned plant part. This is:
The bending of the stem of a plant towards a source of light is caused by the action of a phytohormone known as :
(a) abscisic acid
(b) auxin
(c) gibberellins
(d) cytokinin
The tropic movement that helps the climbing vines to find a suitable support is ______.
Name the part of plant which shows positive geotropism. Why?
The plant part which exhibits negative geotropism is ______.
Where are auxins synthesized in a plant? Which organ of the plant shows:
- Positive phototropism
- Negative geotropism
- Positive hydrotropism
Name the following:
The tropic movement of plant parts in response to chemicals.
Ali has some pea plants in his garden which need a support to grow as seen in the picture given below:
- Name the phenomenon depicted by the shoot in the given figure.
- Define the above phenomenon.
- Write the name of the part marked X.
Define the following term:
Heliotropism
