IS 1 1.2

How Scientists Work

Section 1.2 p. 8-15

n       Designing an Experiment

n       Asking a Question

n                                                                                                                                                     ?

n       Forming a Hypothesis

n                                                                                                              – organisms can come from non-living matter, ex: maggots come from rotting meat

n       Francesco Redi –                                                                                                                 .



n       Designing an Experiment

n       Setting Up a Controlled Experiment

n       An experiment should test only one variable at a time.

n       Manipulated variable –                                                                                       .


n       Responding variable –                                                                                         .


n       Redi’s Experiment    (explain or draw Redi’s experiment)


n       Recording and Analyzing Results

n       ­­­­­­­­­­­­ ­­­­­­­­­­­­­­­                                                                                                                                            .

n       Drawing a Conclusion

n       ­­­­­­­­                                                                                                                                              .

n       Repeating Investigations

n       ______________________

n       Attempted to disprove Redi’s conclusions

n       ______________________

n       Repeated Needham’s experiment, ultimately supporting Redi’s conclusions

n       Pasteur

n       Showed that all living things come from other living things

(explain or draw Pasteur’s experiment)








n       How a Theory Develops

n       Theory – ________________________________________________________________