The tip of a twiner is sensitive and coils around a support. This coiling is called:

$I.$ Increased vacuolation
$II.$ Cell enlargement
$III.$ New cell wall deposition
Which of the above are the characteristics of the phase of elongation?
Choose the correct option accordingly.

The type of growth pattern observed in conifers is

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:

Thigmotropism is best seen in