The growth in plants differs from growth in animals in

Length of the stem at time $0$ is $20 \ cm$. The arithmetic growth rate is $30 \ cm$ per day. What is the length of the stem at the end of the $7^{th}$ day (in $cm$)?

In geometrical growth,the log phase is represented by:

Distribution of growth in a root by marking it at equal intervals with Indian ink was originally studied by

Growth in length of a plant can be measured by

In plants,growth occurs by $...$ through their life span. Choose an appropriate option to complete the given $NCERT$ statement.