Question

What will happen if kill all the the organism in one tropic level??

Answer 1

If we kill all organisms of a particular trophic level than there will ecological imbalance.
Population of organisms of previous trophic level will increase and population of organisms of successive trophic will decrease......

Answer 2

If we kill all the organisms in one trophic level, it will cause too much damage to the environment. For example, if we kill all the lions in a forest, then all the food chains in which lion operates will be disrupted. Lion kill and eat herbivorous animals and keep their population under control.. If all the lions are killed , then the population of herbivorous animals will increase. These herbivorous animals will eat up all the vegetation of the forest which will ultimately turn into a desert.

Hope this will help u :)