27. The diagram of an apparatus given below demonstrates a particular process in plants. Study the same and answer the questions that follow :
(i) Name the apparatus.
(ii) Which phenomenon is demonstrated by this apparatus ?
(iii) Explain the phenomenon mentioned in (ii) above.
(iv) State two limitations of using this apparatus.
(v) What is the importance of the air bubble in the experiment?
(vi) Name the structures in a plant through which the above process takes place.
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Answer:
(i) Potometer
(ii) Transpiration by leaves.
(iii) Transpiration is the process by which excess of water is lost as vapours from leaves and aerial parts of plants.
(iv) ● Introducing air bubble is not easy.
● The twig may not remain alive for long.
(v) As the water is lost from the leaves the bubble moves forward showing Transpiration.
(vi) Leaves
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1- Gannon 's Potometer
2- transpiration effect on temperature,wind velocity,light ,etc
3-loss of water in the form of water vapour from the parts of the plant is called transpiration
4-: introduction of air bubble is typical
: shoot may not be alive for long time
5-to measure the rate of transpiration
6-stomatal and lenticels
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