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प्रश्न
Study the diagram given alongside and answer the questions that follow:
(i) Explain the physiological process of being study.
(ii) What will be the observations in the two test-tubes after about 2-3 days?
(iii) Give a reason for your answer in (ii) above.
(iv) Why is the surface of water covered with oil?
(v) State the purpose of setting up test tube B.
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उत्तर
(i) Transpiration: Loss of water as water vapour from aerial parts of the plant.
(ii) After 2-3 days the level of waterfalls in test-tube A while it remains constant in test tube B.
(iii) The fall in the level of water in test-tube A due to the absorption of water by the roots.
(iv) The oil has been put in each test-tube to prevent the loss of water by evaporation.
(v) The purpose of setting up test-tube B is to show that in the absence of a plant, there is no change in the level of water.
संबंधित प्रश्न
Mention the two ways in which transpiration helps the plants.
Given below is an example of a certain structure and its special functional activity:
Chloroplasts and Photosynthesis.
In a similar way, write the functional activity against each of the following:
Thick cuticle and ………………………..
Which of the following statements are true and which ones are false? Give reason in support of your answer.
Atmospheric humidity promotes transpiration from a green plant.
Given below is an apparatus which was setup to investigate a physiological process in plants. The setup was placed in bright sunlight. Answer the questions that follow:
- Name the process being studied. Define the process.
- Why was the pot enclosed in a rubber sheet?
- Mention two external factors which can accelerate the above process.
- List two adaptations in plants to reduce the above process.
- Draw a neat, labelled diagram of a stomatal apparatus.
Briefly explain how the rate of transpiration is affected by:
Humidity of the atmosphere
Give Reasons for the following:
Young plants wilt on a hot sunny day.
Explain the term:
Cuticular transpiration
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?
