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प्रश्न
Design an experiment to demonstrate hydrotropism.
उत्तर
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
संबंधित प्रश्न
Give the scientific terms used to represent the Bending of roots towards water.
What does a plant root do in response to water? What is this phenomenon known as?
What is the difference between photonasty and thigmonasty?
Name the plant organ which is negatively geotropic.
What are the different types of tropisms? Define each type of tropism. Write the name of stimulus in each case
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 plant part which exhibits negative geotropism is :
(a) root
(b) stem
(c) branch
(d) leaves
The growth of tendrils in pea plants is due to the :
(a) effect of sunlight on the tendril cells facing the sun
(b) effect of gravity on the part of tendril hanging down towards the earth
(c) rapid cell division and elongation in tendril cells that are away from the support
(d) rapid cell division and elongation in tendril cells in contact with the support
Which of the following terms denotes the movement of the root of a plant towards moisture in the soil?
(a) thigmotropism
(b) chemotropism
(c) hydrotropism
(d) geotropism
A growing seedling is kept in a dark room. A burning candle is placed near it for a few days. The top part of seedling bends towards the burning candle. This is an example of :
(a) chemotropism
(b) hydrotropism
(c) phototropism
(d) geotropism
One of the following is not caused by the growth related movement of the concerned plant part. This is:
With the help of an experiment, prove that roots are more positively hydrotropic than geotropic.
The bending of root of a plant in response to water is called ______.
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 |
Thigmonasty can be seen in ______.
Write the scientific terms used to represent the following:
Bending of roots towards the water.
Observe the three figures given below. Which of the following depicts tropic movements appropriately?
 |
 |
 |
| A | B | C |
The instrument which can be used to demonstrate geotropism is ______.
Given below are the figures showing some kinds of tropic movements in plants. Study the same and answer the following questions:
- Which one of these figures is correct? Give reason in support of your answer.
- Name the kinds of movements shown by the root system and shoot system. Define each.
- What are the two stimuli which affect root system and shoot system positively? Name them.
- Which of the following stimuli affects the growth of the root strongly?
- Gravity
- Water
- Draw a neat and labelled diagram of the longitudinal section of a pistil showing chemotropism in an angiospermic plant.
