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प्रश्न
Droplets of water may sometimes be seen along the margins of the leaves of a banana plant, growing in wet soil, in the mornings. Are these dew drops? Comment upon your answer.
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उत्तर
No, they are not dew drops.
This is water given out by the plant body through guttation. Since the banana plant is growing in humid environment, transpiration is hampered. But the roots continue to absorb water from the soil. This builds up a huge hydrostatic pressure within the plant and forces out the excess water from the hydathodes, which are pores present at the tips of veins in the leaf. This is observed especially during the mornings.
संबंधित प्रश्न
Name the following:
An instrument used to find the rate of transpiration.
Which of the following statements are true and which ones are false? Give reason in support of your answer.
Forest contribute in bringing rains.
Which of the following statements are true and which ones are false? Give reason in support of your answer.
Potometer is an instrument used for Demonstration of transpiration occurring from the lower surface of a leaf.
What is a photometer?
Given below is the diagram of an apparatus used to study a particular phenomenon in plants:
- Name the apparatus.
- What is it used for?
- What is the role played by the air-bubble in this experiment?
- What is the use of the reservoir?
- What happens to the movement of the air-bubble if the apparatus is kept:
- in the dark
- in sunlight
- in front of a fan?
Give a reason in each case.
Given below is the diagram of an apparatus used to study a particular phenomenon in plants:
What is it used for?
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Potometer is an instrument, used for measuring the rate of transpiration
The apparatus used to measure the rate of transpiration is ______.
Match the terms given in column A with column B:
| Column A | Column B | ||
| (a) | Hydathodes | (i) | Photosynthesis |
| (b) | Stomata | (ii) | Respiration |
| (c) | Cuticle | (iii) | Regulates opening and closing of stomata |
| (d) | Lenticels | (iv) | Reduces loss of water |
| (e) | Guard cells | (v) | Guttation |
