Arrange the following ecosystems in increasing order of their mean NPP .
(A) Tropical deciduous forest
(B) Temperate coniferous forest
(C ) Tropical rainforest
(D) Temperate deciduous forest

Options

A. `BltAltDltc`
B. `DltBltAltC`
C. `AltCltDltB`
D. `BltDltAltC`

Answer

To arrange the ecosystems in increasing order of their mean Net Primary Productivity (NPP), we need to first identify the NPP values for each ecosystem provided in the question:

1. **Tropical Deciduous Forest**: 1600 g/m²/year
2. **Temperate Coniferous Forest**: 1200 g/m²/year
3. **Tropical Rainforest**: 2200 g/m²/year
4. **Temperate Deciduous Forest**: 1300 g/m²/year

Now, we can summarize the NPP values:

- Tropical Deciduous Forest: 1600 g/m²/year
- Temperate Coniferous Forest: 1200 g/m²/year
- Tropical Rainforest: 2200 g/m²/year
- Temperate Deciduous Forest: 1300 g/m²/year

Next, we will arrange these ecosystems in increasing order based on their NPP values:

1. **Temperate Coniferous Forest**: 1200 g/m²/year (Lowest)
2. **Temperate Deciduous Forest**: 1300 g/m²/year
3. **Tropical Deciduous Forest**: 1600 g/m²/year
4. **Tropical Rainforest**: 2200 g/m²/year (Highest)

Thus, the increasing order of ecosystems based on their mean NPP is:

**(B) Temperate Coniferous Forest < (D) Temperate Deciduous Forest < (A) Tropical Deciduous Forest < (C) Tropical Rainforest**

Final Answer: BDAC