Which is incorrect about biodiversity

Options

A. Areas with very few plant and animal species with no threatened species are called biodiversity hotspots
B. Biodiversity increases from higher altitudes to lower altitudes
C. Biodiversity decreases from equator to polar regions
D. Depletion in genetic diversity of crop plants is mainly due to introduction of better varieties with high yield, disease resistance,
etc.

Answer

To determine which statement about biodiversity is incorrect, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Examine the First Statement**:
- The first statement claims that areas with very few plant and animal species with no threatened species are called biodiversity hotspots.
- **Analysis**: This statement is incorrect because biodiversity hotspots are defined as regions that are rich in plant and animal species and have a high degree of biodiversity, not areas with very few species.

2. **Examine the Second Statement**:
- The second statement says that biodiversity increases from higher altitudes to lower altitudes.
- **Analysis**: This statement is correct. Generally, biodiversity tends to decrease as altitude increases. Therefore, this statement is accurate.

3. **Examine the Third Statement**:
- The third statement claims that biodiversity decreases from equator to polar regions.
- **Analysis**: This statement is also correct. Biodiversity is highest at the equator due to the warm climate and abundant sunlight, and it decreases as one moves towards the polar regions.

4. **Examine the Fourth Statement**:
- The fourth statement states that depletion in genetic diversity of crop plants is mainly due to the introduction of better varieties with high yield, disease resistance, etc.
- **Analysis**: This statement is correct as well. The introduction of high-yielding varieties often leads to a reduction in the genetic diversity of crop plants.

### Conclusion:
After analyzing all four statements, the incorrect statement is the **first statement**, which misdefines biodiversity hotspots.

### Final Answer:
The incorrect statement about biodiversity is: "Areas with very few plant and animal species with no threatened species are called biodiversity hotspots."

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