student setup an experiment using a well-watered plant. The plant’s roots and soil were covered with a rubber sheet. The plant was then kept in a glass bell jar and sealed with Vaseline at the bottom part to prevent the flow of air. The student keeps the apparatus in the light and observes water drops inside the jar after 2 hours as shown in the image. What can be evaluated about transpiration from this experiment? *
Answers
Answer:
(i) The process of transpiration is demonstrated in the experiment.
(ii)The process in which plants lose water in the form of vapour from its aerial parts is called transpiration.
(iii)The pot was covered with a plastic sheet to prevent escape of the soil water as vapour.
(iv) The control for this experiment can be set up as same without a living plant.
(v) Due to transpiration there is an upward movement of water so roots can absorb more water and thus minerals from soil. The second benefit is that the transpired water forms a cool blanket around the plant thus protecting it from the heat of sun.
(vi)The stomata are sunken into pit. Stomata are covered by hair. The leaf is narrow to reduce the number of stomata.
Answer:
(i) The experiment illustrates the transpiration process.
(ii) Transpiration is the mechanism through which plants lose water as vapour from their aerial portions.
(iii) To stop soil water from escaping the pot as vapour, a plastic sheet was placed over the container.
(iv) Without a living plant, the control for this experiment can be set up similarly.
(v) Water moves upward as a result of transpiration, allowing roots to draw more water and minerals from the soil as a result. The second advantage is that the transpired water surrounds the plant in a cold layer, shielding it from the sun's heat.
(vi) Stomata are recessed into a pit. Hair covers the stomata. To lessen the number of stomata, the leaf is thin.
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