1) What is a pesticide? a) A chemical that kills insects b) A chemical that makes plants grow c) A chemical that kills weeds d) A chemical that attracts bees 2) What is the correct name for this process: 'Chemicals used in farming can enter the food chain and become more concentrated the further up you go.' a) biological control b) bioaccumulation c) bio control d) white fly 3) Which of the following is NOT a limiting factor? a) water b) carbon dioxide c) oxygen d) nutrients 4) Which of the following increases yield? a) growing plants on a hill b) using a green house c) rain dance d) planting at night

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