Question

A controlled experiment was conducted to analyze the effects of darkness and boiling on the photosynthetic rate of incubated chloroplast suspensions. The dye reduction technique was used. Each chloroplast suspension was mixed with DPIP, an electron acceptor that changes from blue to clear when it is reduced. Each sample was placed individually in a spectrophotometer and the percent transmittance was recorded. The three samples used were prepared as follows.

Sample 1 – chloroplast suspension + DPIP

Sample 2 – chloroplast suspension surrounded by foil wrap to provide a dark environment + DPIP

Sample 3 – chloroplast suspension that has been boiled + DPIP

Identify and explain the controls for the experiment.

Answer 1

Answer:

Despite ups and downs from year to year, global average surface temperature is rising. By the beginning of the 21st century

Answer 2

Answer:

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Explanation:

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