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
• B. 2
• C. 10
• D. 8

Answer 1

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’.
$L_t=6cm{L}_o=2cmt=2$ hr.

Therefore, 6=2+$(r\times 2)$ 2r=6 - 2 r =2