Answer :
Oil is added over water in the test tube to ensure that no water loss takes place due to direct evaporation from the test tube and the required result obtained is correct.
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PREVIOUSName the follow:(i) The state of a cell when it cannot accommodate any more water ………………..(ii) Pressure of the cell contents on the cell wall. ………………….(iii) The part of a plant cell which is like the leather casing of a football ……………………(iv) The condition that is opposite to turgid. …………………(v) The state of a plasmolysed cell after the re-entry of water ………………………(vi) The pressure under which water passes from the living cells of a root into xylem …………………….NEXT. Look at the experiment shown in Fig 4.16 on the next page. Why was it necessary to take coloured eosin solution in water in the beaker?
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