What will happen if we kill all the organisms in one trophic level?
If we kill all the organisms in one trophic level, it will cause severe disruption to the entire ecosystem. The organisms at the trophic level above will lose their food source and may starve or die, as they depend on the lower level for energy transfer. Since only about 10% of energy is transferred to the next level, the consumers at higher levels are already limited in number and cannot survive without their prey.
The organisms at the trophic level below will increase in number because there would be no consumers to feed on them. For example, if herbivores are eliminated, producers will grow unchecked. The complex relationships in the food web will be disturbed, as each organism is generally eaten by two or more kinds of organisms. This will ultimately damage the ecosystem balance.
Explanation
The answer draws from the context about trophic levels, energy transfer (10% rule), and food web complexity. The context explains that each step of the food chain forms a trophic level, and organisms at various levels are interdependent. The food web shows branching relationships where each organism is eaten by multiple others, indicating that removing one trophic level disrupts multiple connections. The 10% energy transfer concept explains why higher trophic levels are vulnerable to the loss of lower levels.