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Question

A primary root grows from 5 cm to 19 cm in a week. The absolute growth rate is ________ and the relative growth rate is _______ respectively, over a period of one week.


A

2/day and 2.8

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B

2/day and 2

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C

28/day and 28

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D

28/day and 4

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Solution

The correct option is A

2/day and 2.8


Absolute growth rate is the total growth per unit time. Relative growth rate is the increase in growth of a system with respect to initial parameter during a constant period of time.

Total growth rate in a week (7-days) = 19-5 = 14 cm.

Absolute growth per day =Total growth rateNumber of days= 147 = 2.0/day.

Relative growth rate = Total growth rateInitial growth rate= 145 = 2.8.


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