Viable material of endangered species can be preserved by :

Options

A. Gene bank
B. Gene library
C. Herbarium
D. Gene pool

Answer

To solve the question regarding how viable material of endangered species can be preserved, we will analyze each option provided and determine the correct answer step by step.

### Step-by-Step Solution:

1. **Understanding Endangered Species**:
- Endangered species are those that are at a high risk of extinction due to various factors such as habitat loss, poaching, and invasive species. Therefore, preserving their genetic material is crucial for their survival.

2. **Analyzing the Options**:
- **A. Gene Bank**: A gene bank is an institution that preserves genetic material from various organisms, including seeds, tissues, and even living plants. It maintains stocks of viable seeds and can store genetic diversity, which is essential for the conservation of endangered species.
- **B. Gene Library**: A gene library is a collection of DNA sequences from an organism. It does not preserve living material or seeds but rather focuses on the genetic information. This is not primarily aimed at preserving endangered species.
- **C. Herbarium**: A herbarium is a collection of preserved plant specimens. While it is useful for studying plant diversity, it does not focus on preserving viable genetic material or seeds.
- **D. Gene Pool**: A gene pool refers to the total genetic diversity found within a population or species. It is a concept rather than a physical storage method and does not directly preserve material.

3. **Conclusion**:
- Based on the analysis, the most suitable option for preserving viable material of endangered species is **A. Gene Bank**. Gene banks store and maintain viable seeds and genetic material, which can be crucial for the conservation and potential restoration of endangered species.

### Final Answer:
The viable material of endangered species can be preserved by **A. Gene Bank**.