• What is the difference between a food chain and a food web?
• Why is nutrient cycle in ecosystem called as bio geo chemical cycle . How geological factors affect it  What chemical reactions take place in nutrient cycling.
• What will happen if we kill all the organisms in one trophic level  
• Is food web a combination of food chains?
• What are trophic levels Give example of food chain state the different tropic levels.  
• If the following food chain 5 J of energy is available to man, How much energy was available at producer level?   Plant --------> Sheep --------->Man
• how will the unutilized energy of an organism be released in the air?
  
• what is community heat?
  
• Which will get more energy secondary consumers or tertiary consumers?
• In the following food chain, 20,000 J of energy was available to the plants. How much energy would be available to man in this chain? Plants--> Sheep --> Man

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