I salute you for taking the risk to take the task in this encounter.
So in answering the questions, you are expected to:
distinguish abiotic from biotic including their sub-types;
recognize the difference of natural and man-made ecosystems,
determine the roles of each trophic level in a food chain;
formulate and organize your ideas in order to create a poster of an ecosystem and a food web of a given area/topic that the teacher will be giving.
THIS TASK SHOULD BE FINISHED WITHIN THE ALLOTTED DAY. FAILURE TO MEET THE DEADLINE WILL HAVE DEDUCTION POINTS.