Advertisements
Advertisements
प्रश्न
The figure given below represents an experimental setup with a weighing machine to demonstrate a particular process in plants. The experimental set-up was placed in bright sunlight. Study the diagram and answer the following questions:
- Name the process intended for the study.
- Define the above mentioned process.
- When the weight of the test tubes (A and B) is taken before and after the experiment, what is observed? Give reasons to justify your observations in A & B.
- What is the purpose of keeping the test tube B in the experimental set-up?
- What is the purpose of putting oil in the test tube?
Advertisements
उत्तर
- Transpiration.
- It is the release of water vapours from the surface of the plant, mainly from the leaves.
-
- Before: the weights of A and B are the same.
- After: 'A' gets lighter as it loses water from transpiration; 'B' stays the same since evaporation causes no loss of water as the surface of water is covered with oil.
- 'B' acts as a control to show that transpiration from the aerial parts I leave of the plant causes water to evaporate.
- By adding oil to the test tube, one hopes to prevent water from evaporating from it.
APPEARS IN
संबंधित प्रश्न
Transpiration helps in creating ______ force and in eliminating excess ______.
Which of the following statements are true and which ones are false? Give reason in support of your answer.
Most transpiration occurs during midday.
Answer the following (only in few words);
In which form, water comes out in transpiration?
Answer the following (only in few words);
When does stomatal transpiration take place in plants?
Differentiate Between Transpiration and Perspiration.
Name the following:
Holes present on the surface of the stems and twigs for transpiration.
Name the following:
Plants in which lenticular transpiration.
Complete the following sentence with appropriate word:
Transpiration is the loss of water__________________from the leaves of the plant.
Column ‘II’ is a list of items related to ideas in Column ‘I’. Match the term in Column ‘II’ with a suitable idea given in Column ‘I’.
| Column I | Column II |
| (i) Transpiration | (a) Cacti plants |
| (ii) Movement of water | (b) Stomata |
| (iii) Guttation | (c) Maize plant |
| (iv) Low rate of transpiration | (d)Xylem |
| (v) The high rate of transpiration | (e) Hydathodes |
