BOTANY Higher Secondary Second Year - Textbooks Online

Respiratory quotient for anaerobic respiration
In anaerobic respiration, carbondioxide is evolved but oxygen is not
consumed. Therefore, the respiratory quotient in such case is infinity. For
example,
zymase
Glucose Ethanol
5.3.7. Compensation point
At a given low concentration of carbondioxide and nonlimiting light
intensity, the photosynthetic rate of a given plant will be equal to the total
amount of respiration, which includes both dark respiration and
photorespiration. The concentration of CO at which photosynthesis just
2
compensates the respiration is referred
to as carbondioxide compensation point.
At carbondioxide compensation point,
the amount of CO 2 uptake for
photosynthesis is equal to that of CO 2
generated. Through respiration including
photorespiration, so the net
photosynthesis is zero under these
conditions.
5.3.8. Fermentation
Fermentation literally means a
chemical change accompanied by
effervescence. The anaerobic breakdown
of glucose to carbondioxide and ethanol
is a form of respiration referred to
fermentation. It is normally carried by
yeast cells and accounts for the
production of alcohol in alcoholic
beverages.
213
Carbondioxide
Sugar solution
Fig.5.23Kuhne’s fermentation
experiment