Upright pyramid can be seen for all the ecological parameters in grassland ecosystem.

Explanation

**Step-by-Step Solution:**

1. **Understanding Ecological Pyramids**: Ecological pyramids are graphical representations that show the relationship between different organisms at various trophic levels in an ecosystem. They can be represented based on three criteria: number of organisms, energy transfer, and biomass.

2. **Types of Ecological Pyramids**:
- **Pyramid of Number**: This pyramid represents the number of organisms at each trophic level. In a grassland ecosystem, the base consists of a large number of producers (plants), which are greater in number than herbivores (primary consumers) and carnivores (secondary consumers). Therefore, the pyramid of number is upright.

- **Pyramid of Energy**: This pyramid illustrates the energy transfer between trophic levels. According to the 10% law, only about 10% of the energy is transferred from one level to the next. Since the energy is maximum at the base (producers) and decreases as we move up, this pyramid is also upright.
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