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Question
Explain why:
Raisins swell up in water.
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Solution
The raisins swell up when placed in water because the water is hypotonic as compared to the raisins so the water enters inside the raisins as a result of endosmosis.
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RELATED QUESTIONS
The diagram of an 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.
Give reason for the following:
If you uproot a plant from the soil, its leaves soon wilt.
The diagram given below represents the results of an experiment conducted on two freshly taken leafy shoots of a herbaceous plant. The lower ends of the shoots dip in ordinary water.
(i) What is the aim of the experiment?
(ii) Some parts of the stem in both the shoots have been removed. Name the conducting tissue in shoot (a) and in shoot (b) that has been removed.
(iii) What are the results of this experiment?

Choose the correct answer:
Absorption of water from soil takes place by __________
Choose the correct answer:
Exudation or bleeding is associated with ___________
Root hairs become flaccid, when fertilizers are added to the moist soil around it. Explain.
Describe structure of root hair.
Root hair is ________ extension of epiblema cells.
Epiphytic plants like orchids absorb water vapours from air with the help of ______ having special tissue called velamen.
Identify the part of the plants which is responsible for maximum absorption of water.
