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A primary root grows from 5 cm – 19 cm in a week. Calculate the relative growth rate over the period.

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40%

20%

60%

80%

answer is B.

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Detailed Solution

Relativ growth rate(RGR) is generally expressed in percentages.

The root increased in size by 14 cms in one week. That means for every one centimeter of root, there is a 2.8 cms increase over 7 days, 5 cms * 2.8 cms = 14 cms.

So the RGR is 40 %.

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