Select the correct statement :

Options

A. Phosphorus cycle is an example of gaseous nutrient cycle
B. Pyramid of biomass in sea is generally inverted
C. By the process of humification , soluble inorganic nutrients go down into the soil horizon
D. A given organism may not occupy more than one trophic level simultaneously

Answer

To solve the question "Select the correct statement," we will analyze each of the provided statements one by one.

### Step-by-Step Solution:

1. **Evaluate the first statement:**
- **Statement:** "Phosphorus cycle is an example of gaseous nutrient cycle."
- **Analysis:** This statement is incorrect. The phosphorus cycle is classified as a sedimentary nutrient cycle, not a gaseous nutrient cycle. The reservoir for phosphorus is primarily found in the Earth's crust and rocks.

2. **Evaluate the second statement:**
- **Statement:** "Pyramid of biomass in sea is generally inverted."
- **Analysis:** This statement is correct. In marine ecosystems, the pyramid of biomass can be inverted because the biomass of the primary producers (phytoplankton) is less than that of the higher trophic levels (like small fishes and large fishes). Thus, as we move up the trophic levels, the biomass increases, which is characteristic of an inverted pyramid.

3. **Evaluate the third statement:**
- **Statement:** "By the process of humification, soluble inorganic nutrients go down into the soil."
- **Analysis:** This statement is incorrect. Humification refers to the process of decomposition of organic matter, leading to the formation of humus, a dark-colored, stable organic material. Humus is resistant to microbial action and does not involve the direct movement of soluble inorganic nutrients into the soil.

4. **Evaluate the fourth statement:**
- **Statement:** "An organism cannot occupy more than one trophic level simultaneously."
- **Analysis:** This statement is also incorrect. An organism can occupy more than one trophic level depending on its feeding habits. For example, a predator can be at one trophic level when it consumes herbivores and at another level when it consumes plants.

### Conclusion:
After evaluating all the statements, the only correct statement is the second one: "Pyramid of biomass in sea is generally inverted."