Which of the following is true:-

Options

A. 32% of amphibians species face threat of extinction
B. Lichens have higher biodiversity than algae & fungi together
C. Ganga basin have higher biodiversity than Amazon rain forest
D. A stable community should show huge variation in productivity from year to year

Answer

To determine which statement is true from the given options, we will analyze each statement one by one.

1. **Statement 1**: "32% of amphibian species face threat of extinction."
- This statement is true. According to various studies and reports, it is estimated that around 32% of amphibian species are indeed facing threats of extinction due to factors such as habitat loss, climate change, pollution, and diseases.

2. **Statement 2**: "Lichens have higher biodiversity than algae and fungi together."
- This statement is false. Lichens are a symbiotic association between fungi and algae (or cyanobacteria). When considering the biodiversity of algae and fungi together, they encompass a wider range of species compared to lichens alone.

3. **Statement 3**: "Ganga basin has higher biodiversity than the Amazon rainforest."
- This statement is also false. The Amazon rainforest is one of the most biodiverse ecosystems on the planet, covering a much larger area (6 to 8 million sq km) compared to the Ganga basin (1.8 million sq km). Therefore, the Amazon rainforest has significantly higher biodiversity.

4. **Statement 4**: "A stable community should show huge variation in productivity from year to year."
- This statement is incorrect. A stable community typically exhibits consistent productivity levels over time. Huge variations in productivity would indicate instability rather than stability.

**Conclusion**: The only true statement among the options provided is the first one: "32% of amphibian species face threat of extinction."