What is phyllotaxy? Name two types of phyllotaxy.

Explanation

### Step-by-Step Text Solution

1. **Definition of Phyllotaxy**:
Phyllotaxy refers to the arrangement of leaves on the stem of a plant. This arrangement is crucial for maximizing light capture for photosynthesis and minimizing shading of lower leaves.

2. **Types of Phyllotaxy**:
There are three main types of phyllotaxy:
- **Alternate Phyllotaxy**: In this arrangement, leaves are positioned alternately along the stem. This means that each leaf grows at a different level from the previous one, allowing for optimal light exposure. An example of a plant with alternate phyllotaxy is the Barberry (Berberis).
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