Read the following examples that use the above terms: A farmerwanted to test the effects of different amounts of fertilizer ontomatoes. He decided to measure the weight of the tomatoes from theplants (yield), since selling his tomatoes generates income. Heapplies different amounts of fertilizer (the independent variable)to different batches of his plants, and then determines the yield(the dependent variable) of the different batches to decide whatamount of fertilizer works best. He includes some unfertilizedplants for his control. The yield is dependent on the amount offertilizer. The amount of fertilizer is independent because thefarmer can decide how much he will use. Practice Part A: SCENARIO1: A microbiologist working for a pharmaceutical company hasisolated a chemical from a newly discovered strain of a fungus. Hehas done some preliminary tests and thinks that the chemical mightkill the bacteria that cause gonorrhea. He prepares some bacterialgrowth medium (aka “agar”) and adds the new chemical to one batch,and leaves one without the antibiotic. He then adds the same amountof the bacteria that cause gonorrhea to each container of growthmedia and incubates them.

The microbiologist’s hypothesis was thatif____________________________________, then___________________________________________________________________.In this experiment, the antibiotic is the________________________________________ Whether or not thebacteria can grow in the presence of the antibiotic is the___________________________________________________________________________________The growth media without the antibiotic is the__________________________________ Why was the same amount ofbacteria added to both containers of growth media?_______________________________________________________________________SCENARIO 2: Phyllis has just purchased a home in Florida. She isvery excited about growing plumeria trees in her yard. She wantsthe trees to produce as many flowers as possible so she decides totest if different amounts of water to see if that has an effect onthe number of flowers. Her sprinkler system automatically releasesa set amount of water (gallons per minute) so the only way for herto adjust the water amount is to shorten/ lengthen the amount oftime the plants get watered. Tree #1 gets watered every day for 2hours. Tree #2 gets watered every other day for 2 hours. Tree #3gets watered twice a day for 2 hours each interval. What is theindependent variable of this experiment?________________________________________________________________________What is the dependent variable of this experiment?________________________________________________________________________What is a constant of this experiment?________________________________________________________________________What is another constant of this experiment?________________________________________________________________________