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A forest is called a self-sustaining ecosystem mainly because
Give two ways in which animals depend on plants and two ways in which plants depend on animals.
Describe the role of decomposers in a forest. What would happen to the forest if there were no decomposers?
A farmer sprays poison to kill all the frogs in his paddy field because they make noise. Using the food chain Paddy → Grasshopper → Frog → Snake, explain how this would affect (a) the paddy crop and (b) the snakes.
Explain with two examples how flowering plants and insects depend on each other. What could happen to fruit and seed production if the bees in an area disappear?
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