Activity Sheet on Food Chain, Food Web and Symbiosis This is an illustration of a food web. Questions: 1) Identify one food chain that starts from the grass and identify the role of each organism in the trophic level. 2) a) b) c) d) Identify the following, by enclosing it in the prescribed shapes: Square – producers Circle – primary consumers Triangle –secondary consumers Star – decomposers 3)Identify the organisms that would get the least amount of energy in the chain/food web II. SYMBIOSIS Symbiotic Relationships 1) MUTUALISM 2) COMMENSALISM 3) PARASITISM food 4) COMPETITION 1.Anemone crab,, which is a filter feeding Porcelain crab, lives and captures its food from within the tentacles of giant anemones.The giant anemone is unaffected of the presence of the Anemone crab. 2.The shrimp digs a deep burrow, and while underground is quite safe, however it has poor vision and once above ground it is vulnerable to predators. The goby stands guard at the entrance, and signals the shrimp with a flick of its tail when it is safe to come out. The goby benefits by getting a burrow to live in and the shrimp gets warning of predators! 3.Barnacles adhering to the skin of a whale or shell of a mollusk: The barnacle benefits by finding a habitat where nutrients are available. The presence of barnacle populations does not appear to affect or enhance the survival of the animals carrying them. 4.Transmission of malaria, caused by a protozoan Plasmodium, to humans by the bite of an anopheline mosquito. 5.Epiphytes on trees in rainforests. 6.Tree frog uses the plants on trees for protection from the rain, and the plants are not affected at all. 7.Lichens are organisms that grow on rocks, tree branches, or bare ground. They do not have roots, stems, flowers, or leaves. Lichens are composed of a green alga and a colorless fungus .The alga, which has chlorophyll, manufactures its own food through photosynthesis The fungus, which has no chlorophyll, absorbs food from the alga. The fungus helps the alga by covering it and preventing it from drying out. 8.Termites and intestinal flagellates: Termites rely on intestinal flagellates, to digest the wood that they are chewing. These flagellates in turn reside in the stomach of termites and provide nutrition for them. 9.Flukes, tapeworms and roundworms. 10. Two red squirrels, locked together tooth and claw, tumbling through dried leaves in a fight over territory.