Advertisements
Advertisements
Question
Design an experiment to demonstrate hydrotropism.
Solution
Take two small beakers and label them as A and B. Fill beaker A with water. Now make a cylindrical-shaped roll from a filter paper and keep it as a bridge between beaker A and beaker B, as shown in the figure. Attach few germinating seeds in the middle of the filter paper bridge. Now, cover the entire set-up with a transparent plastic container so that the moisture is retained.
Observation:
The roots of the germinating seeds will grow towards beaker A.
This experiment demonstrates the phenomenon of hydrotropism.
APPEARS IN
RELATED QUESTIONS
What happens to the dandelion flower
- during the daytime, and
- at night?
What is this phenomenon known as?
Give one example of chemotropism. State whether this example is of positive chemotropism or negative chemotropism.
Give one example of a plant part which is positively phototropic but negatively geotropic.
To which directional stimuli do roots respond?
Plant shoot grows upward in response to ______.
The growth of a pollen tube towards the ovule caused by a sugary substance as stimulus is an example of :
(a) phototropism
(b) chlorotropism
(c) gravitropism
(d) chemotropism
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:
What is meant by positive and negative tropic movements in plants? Explain them by giving suitable examples.
Plants take in carbondioxide for photosynthesis but need ______ for their living.
Match column A with column B.
| Column A | Column B |
| Roots growing downwards into soil. | Positive phototropism |
| Shoots growing towards the light. | Negative geotropism |
| Shoots growing upward. | Negative phototropism |
| Roots growing downwards away from light. | Positive geotropism |
What is chlorophyll?
The stimulus in the process of thigmotropism is:
The movement of shoot towards light is
What is a tropic movement? Explain with an example.
What does a Mimosapudica plant do in response to touch? What is the phenomenon known as?
Where are auxins synthesized in a plant? Which organ of the plant shows:
- Positive phototropism
- Negative geotropism
- Positive hydrotropism
The height of a plant is regulated by ______.
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.
Name the stimulus which causes the following movement in plant:
Hydrotropism
Define the following term:
Clinostat
