In the context of photosynthesis, C3, C4, and CAM plants have adapted different strategies to fix carbon and reduce the impact of photorespiration under varying environmental conditions. Which of the following statements accurately distinguishes these pathways while mentioning a unique feature or condition associated with each?
1
C3 plants directly fix carbon dioxide into a 3-carbon compound via the Calvin cycle in all conditions, C4 plants utilize distinct cells for carbon fixation and the Calvin cycle to minimize photorespiration, and CAM plants close their stomata during the day to reduce water loss.
2
C3 plants perform photosynthesis only at night utilizing an enzyme to fix carbon dioxide into a 4-carbon compound, C4 plants perform carbon fixation and the Calvin cycle in the same cells under high temperatures, and CAM plants employ a shuttle mechanism to transport fixed carbon dioxide to specialized bundle sheath cells.
3
C3 plants use an enzyme to fix carbon dioxide into a 3-carbon compound within the same cell where the Calvin cycle takes place, C4 plants conduct carbon fixation at night to store carbon dioxide, and CAM plants utilize a special enzyme allowing them to fix carbon dioxide even when stomata are closed during the day.
4
C3 plants fix carbon dioxide into a 3-carbon compound via the Calvin cycle, predominantly under cooler temperatures, C4 plants have a spatial separation between carbon fixation and the Calvin cycle to efficiently use carbon dioxide and reduce photorespiration, and CAM plants fix carbon dioxide at night to reduce water loss during hot and dry conditions.
5
Question Not Attempted