Consider two plots , where plot 'X' is having less species compared to plot 'Z', Select the true statement regarding X and Z .

Options

A. Plot 'X' shows less year to year variation in total biomass
B. Plot 'Z' is less resistant to natural disturbance
C. Plot, 'X' has more productivity than plot 'X'
D. Plot 'Z' has more productivity then plot 'X'

Answer

To solve the question regarding the two plots X and Z, we need to analyze the information provided about the species composition and productivity of each plot.

### Step-by-Step Solution:

1. **Understanding the Plots**:
- Plot X has fewer species compared to Plot Z.
- This implies that Plot Z has a higher species richness.

2. **Analyzing Productivity**:
- Generally, ecosystems with more species (like Plot Z) tend to have higher productivity. This is due to the complementary use of resources by different species, which can lead to more efficient energy capture and biomass production.
- Conversely, Plot X, with fewer species, is likely to have lower productivity.

3. **Resistance to Disturbance**:
- Ecosystems with higher biodiversity (like Plot Z) are often more resilient to disturbances. This means they can recover more quickly from environmental changes or disruptions.
- Plot X, with fewer species, may be less resilient and more susceptible to disturbances.

4. **Year-to-Year Variation**:
- While it is not directly stated, ecosystems with fewer species (like Plot X) may show less variation in total biomass year-to-year because they rely on fewer species to maintain biomass levels.
- However, this point is not clearly measurable without specific data.

5. **Conclusion**:
- Based on the analysis, the most accurate statement regarding the two plots is that Plot Z has higher productivity due to its greater species richness.

### Final Answer:
The true statement regarding Plot X and Plot Z is that Plot Z has more productivity.