Question

Arithmetic growth includes all except:

• A. Constant growth rate
• B. It is found in root and shoot cells
• C. It is expressed as $L_t=L_o+rt$
• D. Its characteristic graph is sigmoid

Answer 1

The correct option is D Its characteristic graph is sigmoid

In exponential growth, sigmoid curve is obtained.

In arithmetic growth, only one daughter cell continues to divide while the other differentiates and matures. The simplest expression of arithmetic growth is exemplified by a root elongating at a constant rate. On plotting the length of the organ against time, a linear curve is obtained. Mathematically, it is expressed as:

$L_t=L_0+rt{L}_t=\text{length at time ‘t’}{L}_0=\text{length at time ‘zero’}\text{r = growth rate / elongation per unit time.}$

For the given question, except option "d", all the other options are applicable to arithmetic growth. Thus the correct answer is "option d".