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Respiration in Plants

Multiple Choice Questions

81.

The name of process of aerobic respiration, in which energy is provided in steps in electron transport chain, is :

EMP-pathway
decarboxylation
photophosphorylation
oxidative phosphorylation

82.

In which of the following process 36 ATP molecules are produced by per hexose molecule

Glycolysis
Krebs' cycle
Direct oxidation pathway
None of the above

83.
The value of RQ at compensation point is

unity

infinity

> 1

zero

zero

The (light) compensation point is the light intensity on the light curve where the rate of photosynthesis exactly matches the rate of cellular respiration. At this point, the uptake of CO₂ through photosynthetic pathways is equal to the respiratory release of carbon dioxide, and the uptake of O₂ by respiration is equal to the photosynthetic release of oxygen.

In assimilation terms, at the compensation point, the net carbon dioxide assimilation is zero. Leaves release CO₂ photorespiration and cellular respiration, but CO₂ is also converted into carbohydrate by photosynthesis. Assimilation is therefore the difference in the rate of these processes. At a normal partial pressure of CO₂, there is irradiation at which the net assimilation of CO₂ is zero.