Pyramid of biomass for a grazing food chain represents

Options

A. gradual decrease in biomass from apex to base
B. gradual decrease in biomass from producers to the tertiary consumers.
C. gradual increase of the biomass from producers to the tertiary consumers.
D. non change in biomass.

Answer

### Step-by-Step Solution:

1. **Understanding the Pyramid of Biomass**:
- The pyramid of biomass illustrates the total mass of living material at each trophic level in an ecosystem. It typically starts with producers at the base and moves up to primary consumers, secondary consumers, and tertiary consumers.

2. **Identifying Trophic Levels**:
- In a grazing food chain:
- **Producers** (e.g., plants) are at the first trophic level.
- **Primary Consumers** (e.g., herbivores) are at the second trophic level.
- **Secondary Consumers** (e.g., carnivores that eat herbivores) are at the third trophic level.
- **Tertiary Consumers** (e.g., carnivores that eat other carnivores) are at the fourth trophic level.

3. **Analyzing Biomass Distribution**:
- At the first trophic level (producers), there is a large amount of biomass because they convert solar energy into organic matter.
- As you move up the trophic levels, the biomass decreases. This is due to energy loss at each level (approximately 90% of energy is lost as heat, respiration, etc., leaving only about 10% to be passed on).

4. **Conclusion**:
- Therefore, the pyramid of biomass for a grazing food chain represents a **gradual decrease in biomass from producers to tertiary consumers**.

### Final Answer:
The correct option is: **Gradual decrease in biomass from producers to the tertiary consumers**.

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