Step-by-step explanation:
The electron transport chain represents the directional flow of electron through electron carriers in the chloroplast and mitochondria in the cell.
The electron transport chain in the chloroplast is involved in the production of the ATP and NADPH. These molecules are synthesized during the light-dependent phase of the photosynthesis process.
If the prairie grass is affected with a virus that interferes with the electron transport chain occurring in chloroplast then the ATP and NADPH will nor be synthesized as a result of which the Calvin cycle will not proceed which require these intermediate to produce glucose. The plant will die ultimately die because of this virus.