Drosera obtains proteins by digesting the insects.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Plant**: Drosera, commonly known as sundew, is a type of carnivorous plant. This means it has adapted to obtain nutrients by consuming other organisms, primarily insects.

2. **Mechanism of Insect Capture**: Drosera plants have specialized structures that help them capture insects. These structures are often covered with glandular hairs that secrete a sticky substance known as mucilage.

3. **Function of Mucilage**: The mucilage acts as a trap. When an insect lands on the plant, it becomes stuck in the gluey substance. This prevents the insect from escaping.

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