Phenol red, a pH indicator, is used in the experiment todetermine respiration activity by showing CO2production.
Table:Â Â CO2 Production by Beans
Beans
Indicator Color
(Phenol Red)
Conclusion
(CO2 present or absent)
Germinating
Yellow
Present
Ungerminated-dry
Red
Absent
Questions;
1. How does phenol red work as a pH indicator?
2. Why does this show respiration activity?
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