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.
|
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: -The CAM pathway Like C4 plants, the use PEP carboxylase to fix CO2, forming oxaloacetate. The oxaloacetate is converted to malate which is stored in cell vacuoles. During the day when the stomata are closed, CO2 is removed from the stored malate and enters the Calvin cycle.
Detailed explanation-3: -Introduction. It is generally accepted that for C3 and C4 plants stomatal closure minimizes transpirational water loss (E) at night when there is no opportunity for carbon gain.
Detailed explanation-4: -PEP carboxylase, which is located in the mesophyll cells, is an essential enzyme in C4 plants. In hot and dry environments, carbon dioxide concentrations inside the leaf fall when the plant closes or partially closes its stomata to reduce water loss from the leaves.