Secondary growth does not occur in monocot stems because
(a) Scattered
(b) Open
(c) Close
(d) Radial

Explanation

To solve the question "Secondary growth does not occur in monocot stems because," we need to analyze the options provided and understand the underlying biological concepts related to monocot stems and their vascular structures.

### Step-by-Step Solution:

1. **Understanding Secondary Growth**:
- Secondary growth refers to the increase in thickness or girth of the plant stems and roots. This growth is primarily due to the activity of the cambium, a type of lateral meristem that produces secondary xylem (wood) and secondary phloem.

2. **Identifying the Role of Cambium**:
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