The available biomass for the consumption to heterotrophs is called

Options

A. Gross primary productivity
B. Net primary productivity
C. Primary productivity
D. Secondary productivity

Answer

To solve the question "The available biomass for the consumption to heterotrophs is called," we can follow these steps:

### Step 1: Understand the Terms
- **Biomass** refers to the total mass of living matter in a given area or volume.
- **Heterotrophs** are organisms that cannot produce their own food and rely on consuming other organisms for energy. This includes herbivores and decomposers.

### Step 2: Identify Types of Productivity
- **Gross Primary Productivity (GPP)**: This is the total amount of organic matter produced by photosynthesis in a given area over a specific time period.
- **Net Primary Productivity (NPP)**: This is the amount of organic matter that remains after the plants have used some of the GPP for their own respiration. NPP represents the biomass available for consumption by heterotrophs.

### Step 3: Relate NPP to Heterotrophs
- Since heterotrophs consume the biomass produced by plants, the relevant term for the biomass available to them is **Net Primary Productivity (NPP)**.

### Step 4: Eliminate Other Options
- **Primary Productivity** is a general term that can refer to both GPP and NPP, but it does not specifically indicate the biomass available to heterotrophs.
- **Secondary Productivity** refers to the generation of biomass by heterotrophs through the consumption of primary producers, which is not what the question is asking.

### Conclusion
The correct answer to the question is **Net Primary Productivity (NPP)**, as it specifically refers to the available biomass for consumption by heterotrophs.

### Final Answer
**Net Primary Productivity (NPP)**

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