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Question

The pollen tube of maize plant grows up to 6 cm from 2 cm within 2 hr duration. The rate of growth is _____cm/hr


A

4

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B

2

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C

10

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D

8

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Solution

The correct option is B

2


Length of the plant at time “t”, is represented by Lt = Lo + rt

where Lt in this case represents the Length at time ‘t’, Lo represents the initial length of the organ or Length at time ‘0’ and r is the rate of growth or elongation per unit time ‘t’.
Lt=6 cm Lo=2cm t=2 hr.

Therefore, 6=2+(r×2) 2r=6 - 2 r =2


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