Deepti has read newspaper reports about the effects of acid rain on the TAJ MAHAL in Agra and wants to know what effects would acid rain have on the plants. She carries out the following experiment.
(i) prepares 4 solutions of different concentrations of vinegar in water,
(ii) prepares 4 identical pots with pea plants,
(iii) water the 4 pots, each with the same volume of the vinegar solutions respectively, for 5 consecutive days,
(iv) observe the growth in the plants for a month.
What else should Deepti have done to be able to tell there is definitely an effect? *
OPTIONS
(a) watered the pots with only pure vinegar
(a) used different types of the plants in each of the pots
(a) watered all the pots with equal amounts of rainwater
(a) used an identical pot and watered it with normal water
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