Write a short note on heterospory and its significance.

Explanation

### Step-by-Step Solution

1. **Definition of Heterospory**:
Heterospory refers to the production of two distinct types of spores by a single plant species. These spores differ in size and sex.

**Hint**: Remember that heterospory involves two different types of spores, which is a key characteristic.

2. **Occurrence**:
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