Exponential Growth Curve

Q. The exponential growth in the leaf surface area (A) of a plant can be represented as

1. $A_t=A_0\times rt$
2. $A_t=A_0+rt$
3. $A_t=A_0+e^{rt}$
4. $A_t=A_0{e}^{rt}$

Q. The following data were obtained from an experiment on a tissue culture showing exponential growth:
Initial weight (in grams) Final weight (in grams) Time of growth (in seconds)

2	4	1

What is the relative growth rate in g/s?

1. 0.693
2. 2.100
3. 3.523
4. 4.612