Question

What is the significance of secondary growth in plants?

Answer 1

The correct answer is A. 
Secondary growth in plants allows many woody and non woody plants to grow tall and strong. The growth basically occurs in the roots and the stems and it is controlled by lateral meristem.  Examples of non woody plants that undergo secondary growth include: carrot, potato, tuber, etc.<span />

Answer 2

The growth starts from the roots and them to other parts. So the significance of secondary growth in plants is To support the extra weight of the tree due to an increase in its height and to prevent it from collapsing. So the answer to your question is letter A.