Which of the following is not a cause for loss of biodiversity ?

Options

A. Destruction of habitat
B. Invasion by alien species
C. Keeping animals in zoological parks
D. Over-exploitation of natural resources

Explanation

To determine which option is not a cause for loss of biodiversity, we need to analyze the options provided and identify the one that does not fit with the known causes. The main causes of biodiversity loss are often summarized as the "evil quartet," which includes:

1. **Destruction of Habitat**: This is the most significant cause of biodiversity loss. Habitat destruction occurs when natural environments are altered or destroyed, making it difficult for wildlife to survive. This can happen through deforestation, urbanization, and pollution.

2. **Over-Exploitation**: This refers to the unsustainable use of natural resources, including the hunting and harvesting of species at rates faster than their populations can recover. This can lead to significant declines in species populations.

3. **Invasion by Alien Species**: When non-native species are introduced into an ecosystem, they can outcompete, prey on, or bring diseases to native species, leading to declines in native biodiversity.

4. **Co-Extinction**: This occurs when the extinction of one species leads to the extinction of another species that is dependent on it. For example, if a pollinator species goes extinct, the plant species that relies on it for reproduction may also go extinct.

Now, let’s analyze the options provided in the question:

- **Option A**: Destruction of Habitat (Cause of biodiversity loss)
- **Option B**: Over-Exploitation (Cause of biodiversity loss)
- **Option C**: Keeping animals in zoological parks (Not a cause of biodiversity loss)
- **Option D**: Invasion by Alien Species (Cause of biodiversity loss)

From this analysis, we can conclude that **Option C: Keeping animals in zoological parks** is not a cause for loss of biodiversity. In fact, zoological parks can serve as a conservation tool, helping to protect endangered species and maintain genetic diversity.

### Step-by-Step Solution:
1. **Identify the Causes of Biodiversity Loss**: Understand the main factors contributing to biodiversity loss, known as the "evil quartet."
2. **Analyze Each Option**: Review the options provided in the question to see which one aligns with the known causes.
3. **Determine the Odd One Out**: Identify the option that does not fit with the causes of biodiversity loss.
4. **Conclude**: State that keeping animals in zoological parks is not a cause of biodiversity loss but rather a conservation effort.