Which tissue is responsible for the primary growth of plants, increasing their length and girth?

Meristem consists of

Specialised regions of plants having active cell division are called

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

Cells having no power of cell division are formed by

Intercalary meristem is found between the

In plants exhibiting unusual secondary growth, like in Bougainvillea, the additional cambia arise from:

Meristematic tissue in vascular bundle is

A tree grows at the rate of 0.5m per year. What will be the height of board fixed at 1.5m above the ground level five years age?

The tunica-corpus theory was proposed by

Leaf is formed from?