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प्रश्न
Name the factors which affect the rate of transpiration? State their role in each case.
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उत्तर
The following are the main factors that affect the rate of transpiration:
- Sunlight: During daytime, the rate of transpiration is faster. This is because the stomata remain open to allow the inward diffusion ofcarbondioxide for photosynthesis.
During dark, the stomata are closed, and hence transpiration hardly occurs at night. - Temperature: Transpiration is faster on hot summer days as compared to cold winter.
- Wind: Transpiration is more when the wind is blowing faster as water evaporates faster from the leaves.
- Humidity: Transpiration is reduced if the air is humid. Air cannot hold any water molecules when it is already laden with moisture (humidity).
- Low atmospheric pressure: The rate of transpiration increases when the pressure is low.
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संबंधित प्रश्न
Which one of the following favours the fastest transpiration rate?
Choose the correct answer:
Transpiration is more ____________
Choose the correct answer:
Who had said that "transpiration is a necessary evil"?
What are the advantages of transpiration to the plant?
Differentiate Between Transpiration and Perspiration.
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?
The following diagram is set up to demonstrate an experiment.
Five plants A, B, C, D, and E were placed in a beaker containing water. The water in each beaker was covered with a layer of oil. The leaves were removed from plant D in plant B, upper surfaces of all the leaves were covered with Vaseline, in-plant C the lower surfaces of all the leaves were covered with Vaseline and plant E was exposed to strong light. The beakers were then left for a few hours and at the end of the experimental period, weights of each beaker were taken.
Write the correct answer out of the five available choices given under each question:
I. In which beaker would you expect the greatest decrease in weight?
(i) A (ii) B (iii) C (iv) D (v) E
II. In which beaker the change of weight would be minimum?
(i) A (ii) B (iii) C (iv) D (v) E
III. Which plant would remain healthy for a longer period of time?
(i) A (ii) B (iii) C (iv) D (v) E
IV. In this experiment which plant can be considered as the uncontrolled one?
(I) A (ii) B (iii) C (iv) D (v) E
V. The difference of weight would b maximum between:
(i) A and B (ii) A and C (iii) A and D (iv) A and E (v) D and E
State the Location:
Lenticels
Write the functional activity of the following structure:
Hydathodes
