Designing and Evaluating Experiments Activity

Designing and Evaluating Experiments Activity - CLASS COPY...

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CLASS COPY Designing and Evaluating Experiments Directions: With a partner and on your own paper, use the following information to complete Parts A through E. Demetri did the following investigation in a local college laboratory to see how carbon dioxide (CO 2 ) affects plant growth. Demetri grew bean plants in growth chambers where he could control the amount of oxygen (O 2 ) and CO 2 in the air around the plants. He grew the bean plants in water with mineral nutrients instead of soil. Demetri had to completely dry the plants in an oven to get the plants’ dry mass. Research Question: What is the effect of different amounts of carbon dioxide (CO 2 ) in air on the dry mass of bean plants? Hypothesis: As the concentration of CO 2 in air increases, the dry mass of bean plants will increase because bean plants use CO 2 for growth. [ Is the above hypothesis written correctly ?] Materials: bean plants with the same mass: pot + soil + plant water with mineral nutrients identical growth chambers labeled A, B, and C containers of CO 2 and O 2 gas monitors for CO 2 and O 2 gas drying oven electronic balance
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Procedure: 1. Put 12 bean plants into Chamber A as shown in the Investigation Setup diagram. Do the same to Chambers B and C. In each chamber, randomly assign each bean plant a number from 1 to 12. 2.
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Designing and Evaluating Experiments Activity - CLASS COPY...

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