Which of the following is correctly matched?

Options

A. Parthenium hysterophorus -Threat to biodiversity
B. Stratification - Population
C. Aerenchyma - Opuntia
D. Age pyramid - Biome

Answer

To determine which of the options is correctly matched, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Analyze the first option: Parthenium Hysterophorus - Threat to Biodiversity**
- Parthenium Hysterophorus is indeed an invasive weed that poses a significant threat to biodiversity. It can damage crops and cause health issues in humans and animals. Therefore, this option is correctly matched.

2. **Analyze the second option: Stratification - Population**
- Stratification refers to the arrangement of different layers of flora and fauna in an ecosystem, not directly to the concept of population. Thus, this option is incorrectly matched.

3. **Analyze the third option: Arenchyma - Opuntia**
- Arenchyma refers to a type of plant tissue with large air-filled spaces that help aquatic plants maintain buoyancy. Opuntia, commonly known as prickly pear, is a type of cactus and not directly related to arechyma. Therefore, this option is also incorrectly matched.

4. **Analyze the fourth option: Age Pyramid - Biome**
- An age pyramid represents the distribution of different age groups within a population, while a biome refers to a large ecological area on the earth's surface. These two concepts are not the same, making this option incorrectly matched as well.

### Conclusion:
The only correctly matched option is **Parthenium Hysterophorus - Threat to Biodiversity**.

---