Investigating the Scientific Method Plant & Animal Relationships Phenol Red pH Indicator

Purpose of Experiment Scientific Method Respiration & Photosynthesis Direct Observations & Inferences

Experimental Method..... DAY I 1. pH & Phenol Red Indicator 2. Plant & Animal Experiment 3. Scientific Method DAY II 1. Results & Conclusions 2. Observations & Inferences

Photosynthesis.... Plants make? Require? 1. Sunlight 2. Chlorophyll 3. Water roots 4. ? gas

Chemical Equation >>>>>> Carbon dioxide + water +energy=food + oxygen (sugar) CO 2 + H 2 0 +sun = C 6 H O 2

Cellular Respiration... BOTH plants & animals breakdown food 1. Release energy 2. Makes cell energy 3. Reverse of photosynthesis !

Respiration Equation >>>>> Opposite of Photosynthesis food + oxygen = ATP+ CO 2 +H 2 0 C 6 H O 2 = ATP+ CO 2 +H 2 0

Comparison of both …….. PHTOSYNTHESIS Make food Give off O 2 Use sunlight Use CO 2 RESPIRATION Break apart food Use oxygen Make cell energy Give off CO 2

IB. The 7 Steps 1 State the question 2 Research 3 “If…then….” Hypothesis 4 Experiment 5 Measurable data 6 Analyze results 7 Communicate

IB1.The scientific question(s) light & dark animals & plants

IB4.Controls for the light & dark experiment…. Light tube 5 No plant or animal normal light comparisons Dark tube 8 No plant or animal normal dark comparisons

IB6. Measurable data…….. ?Eyeballed color Machine Color scale with numbers

IB9. Replicates ………….. ? Minimum # Comparison= quality control Evaluate bias

IIB1&5. Exp. Assumptions: About Measurements weak acid ?? formed CO 2 & water from ?? why not plants ?

IIB6. Is Carbon Dioxide present ??? Measure oxygen & carbon dioxide gas chemicals machines

IIB7. Direct Observations…. Direct observations data NOT from prior knowledge today this equipment Inferences not directly measured from prior knowledge assumes

Check your results IIB7 ……. DO “substance”…..color change DO IN oxygen not directly measured IN CO 2 not directly measured IN DO

IIB8.Closed system ….. Plants make oxygen Plants make food Animals make the carbon dioxide For plants to make food