Photosyntheis:
6CO2 + 6H2O + light energy --> C6H12O6 + O2
Respiration:
C6H12O6 + O2 --> 6CO2 + 6H2O
Bromothymol blue, BTB, is an indicator solution that can indicate the presence of carbon dioxide in water. When little or no carbon dioxide is present, BTB is blue. When carbon dioxide is present, BTB turns green or yellow. Yellow indicates more carbon dioxide.
A water plant, Elodea, is placed in a test tube with BTB solution and is exposed to sunlight. The BTB solution turns a bright yellow the next day. What has taken place inside the test tube?
A The Elodea plant has not undergone any cycling of matter.The Elodea plant has not undergone any cycling of matter.
B the Elodea plant has produced CO2 through the process of photosynthesis .the Elodea plant has produced CO 2 through the process of photosynthesis .
C The Elodea plant has produced CO2 through the process of respiration only.The Elodea plant has produced CO 2 through the process of respiration only.
D The cycling of nutrients is evident as the yellow indicator solution shows presence of CO2; photosynthesis and respiration have taken place.The cycling of nutrients is evident as the yellow indicator solution shows presence of CO 2 ; photosynthesis and respiration have taken place.