PHOTOSYNTHESIS
PHOTORESPIRATION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Storing CO2 in a form that can be used during times their stomata are closed.
|
|
|
Keeping their stomata open at all times to prevent low CO2 levels.
|
|
|
A special carrier protein that prevents the entrance of Oxygen into leaves.
|
|
|
Altering (alosteric inhibition) the enzyme RUBISCO to prevent photorespiration.
|
Detailed explanation-1: -C4 plants-including maize, sugarcane, and sorghum-avoid photorespiration by using another enzyme called PEP during the first step of carbon fixation. This step takes place in the mesophyll cells that are located close to the stomata where carbon dioxide and oxygen enter the plant.
Detailed explanation-2: -In both the CAM and C4 pathways, the initial 4-carbon organic molecule ends up being decarboxylated, releasing CO2 for Rubisco to use in the Calvin cycle. Thus, they reduce photorespiration. The leaves of C4 plants perform the Calvin cycle (with Rubisco) in bundle sheath cells.
Detailed explanation-3: -The high temperature will make the plant close its stomata to reduce water loss by evaporation. If the stomata is closed, the oxygen from photosynthesis will build up inside the leaf while the carbon dioxide will not get into the leaf.