An inverted pyramid of number and an inverted pyramid of biomass are respectively seen in:

Options

A. Grassland Tree ecosystem
B. Sea and Tree ecosystem
C. Tree and Sea ecosystem
D. Sea and Grassland ecosystem

Answer

To solve the question regarding the inverted pyramid of number and biomass, we will analyze the characteristics of different ecosystems and how they relate to pyramids of numbers and biomass.

### Step-by-Step Solution:

1. **Understanding Pyramids of Numbers and Biomass**:
- A **pyramid of numbers** represents the number of individual organisms at each trophic level in an ecosystem.
- A **pyramid of biomass** represents the total mass of living matter at each trophic level.

2. **Identifying Inverted Pyramids of Numbers**:
- In a **tree ecosystem**, the pyramid of numbers is often inverted. This is because there are fewer trees (producers) than the number of herbivores (primary consumers) that feed on them. Thus, the base of the pyramid (trees) has fewer individuals compared to the higher trophic levels.

3. **Identifying Inverted Pyramids of Biomass**:
- In a **sea ecosystem**, the pyramid of biomass can also be inverted. This occurs because the biomass of phytoplankton (producers) is less than that of the higher trophic levels, such as fish (secondary consumers), due to the rapid turnover of phytoplankton and the efficiency of energy transfer in aquatic environments.

4. **Matching Ecosystems with Pyramids**:
- Based on the above analysis, the tree ecosystem exhibits an inverted pyramid of numbers, while the sea ecosystem exhibits an inverted pyramid of biomass.

5. **Conclusion**:
- Therefore, the correct answer to the question is that an inverted pyramid of number and an inverted pyramid of biomass are respectively seen in the **tree ecosystem** and the **sea ecosystem**.

### Final Answer:
The correct option is: **Tree ecosystem and Sea ecosystem**.