Population density of terrestrial organisms is measured in terms of individual per :

Options

A. `"meter"^(3)`
B. `"meter"^(4)`
C. meter
D. `"meter"^(2)`

Answer

To solve the question regarding the measurement of population density of terrestrial organisms, we can follow these steps:

### Step 1: Understand the Concept of Population Density
Population density refers to the number of individuals of a species per unit area in a specific geographical region. It helps in understanding how crowded or sparse a population is in a given area.

### Step 2: Identify the Formula for Population Density
The formula for calculating population density (D) is given by:
\[ D = \frac{N}{A} \]
where:
- \( D \) = Population density
- \( N \) = Total number of individuals (population)
- \( A \) = Area in which the population is measured

### Step 3: Determine the Units Used for Area
In ecology, population density is typically expressed in terms of individuals per unit area. The common units for area in ecological studies are:
- Square meters (m²)
- Hectares (ha, where 1 ha = 10,000 m²)
- Square kilometers (km²)

### Step 4: Analyze the Options Given
The options provided in the question are:
- Meter³ (m³)
- Meter⁴ (m⁴)
- Meter² (m²)

Among these options, we need to identify which one is appropriate for measuring area.

### Step 5: Select the Correct Unit
Since population density is defined as the number of individuals per unit area, the correct unit to express this density is square meters (m²). This is because area is measured in square units.

### Conclusion
Therefore, the population density of terrestrial organisms is measured in terms of individuals per square meter (m²).

### Final Answer
**Population density of terrestrial organisms is measured in terms of individuals per meter².**

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