Flowering plants absorb nitrogen from the .......................... mainly in the form of..........................

Explanation

**Step-by-Step Solution:**

1. **Identify the Source of Nitrogen:**
- Flowering plants primarily absorb nitrogen from the soil. This is the first blank in the question.

2. **Determine the Form of Nitrogen Absorbed:**
- The main form in which flowering plants absorb nitrogen is as nitrates. This is the second blank in the question.

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