An experiment was conducted with 4 pots of similar plants which were placed in glass jars A, B, C and D as shown below. Oil was applied on different parts of the leaves of the plants in glass jars A, B and C. All the pots were watered with the same amount of water and weighed. The pots were next covered with clear plastic bags before being placed under bright sunlight.
After 5 hours, each pot was weighed again and the difference in mass was calculated.
(a) Rank the jars in order of increasing loss of water for the 4 pots of plants.
(b) Explain your answer in (a).
(c) What is the purpose of covering the pots with plastic bags ?
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