Secondary growth helps in increasing the _______of the roots and stems.

Explanation

To answer the question "Secondary growth helps in increasing the _______ of the roots and stems," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Secondary Growth**:
- Secondary growth refers to the increase in thickness or girth of plants, particularly in woody plants. This growth occurs in the lateral meristems, which include the vascular cambium and cork cambium.

2. **Identifying the Role of Secondary Growth**:
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