Give scientific reasons: Monocot plants do not show secondary growth.

Explanation

### Step-by-Step Solution:

1. **Understanding Secondary Growth**:
- Secondary growth refers to the increase in the thickness or diameter of the plant stems and roots. This process is primarily facilitated by the presence of a tissue called vascular cambium.

2. **Identifying Vascular Cambium**:
- Vascular cambium is a type of meristematic tissue that is responsible for the production of secondary xylem (wood) and secondary phloem (inner bark). It is found in dicot plants and some gymnosperms.

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