Give two reasons as to why a weed such a Calotropis flourishes in abandoned fields.

Explanation

To answer the question regarding why a weed like Calotropis flourishes in abandoned fields, we can identify two main reasons:

### Step-by-Step Solution:

1. **Toxicity to Herbivores**:
- Calotropis produces toxic compounds such as cardiac glycosides and calotropin. These toxins make the plant unpalatable and potentially harmful to herbivores like cattle and goats. As a result, animals tend to avoid grazing on Calotropis, allowing it to thrive without competition from herbivores.

2. **Allergenic Pollen**:
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