Gametes of threatened species can be preserved in viable and fertile condition for long periods using

Options

A. Wildlife safari parks
B. On-site conservation
C. Cryopreservation
D. Botanical gardens

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about a method to preserve gametes of threatened species in a viable and fertile condition for long periods.

2. **Evaluating the Options**:
- **Wildlife Safari Parks**: These parks allow animals to roam freely in an environment that resembles their natural habitat. However, they do not specifically focus on preserving gametes.
- **On-site Conservation**: This refers to conserving species in their natural habitats. While it is important for overall species conservation, it does not specifically address the preservation of gametes.
- **Botanical Gardens**: These gardens are collections of living plants aimed at illustrating plant relationships. They do not deal with animal gametes.
- **Cryopreservation**: This is a method of preserving biological samples, including gametes, by freezing them at very low temperatures (around -196 degrees Celsius). This process halts biological activity and allows for long-term storage.

3. **Identifying the Correct Answer**: After evaluating all the options, it is clear that cryopreservation is the only method that specifically allows for the long-term preservation of gametes in a viable and fertile condition.

4. **Conclusion**: The correct answer to the question is **cryopreservation**.