The interfascicular cambium develops from the cells of -

In which region are the most distinct annual rings formed?

In dicot stem,secondary growth is due to the activity of:

In dicot stem,the cells of cambium present between the primary xylem and primary phloem is $..........$

Jute fibres are obtained from the

$A$ nail is driven into the trunk of a $30$ year old tree at a point $1$ meter above the soil level. The tree grows in height at the rate of $0.5$ meters a year. After three years,the nail will be