Biennial are plants which complete their life cycle in two years.

Explanation

### Step-by-Step Solution:

1. **Understanding Biennial Plants**:
Biennial plants are defined as plants that complete their life cycle in two years. However, this definition needs to be clarified.

2. **Life Cycle of Biennial Plants**:
In the first year, biennial plants primarily focus on vegetative growth. This means they grow leaves, stems, and roots but do not reproduce during this phase.

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