NEET BIOLOGY

Detailed explanation-1: -Generally, ion and organic solute concentration levels determine the turgor pressure of guard cells and subsequently affect stomatal aperture. Under elevated CO2, stomata tend to close because a greater depolarization seems to appear in GCs.

Detailed explanation-2: -Higher than ambient CO2 concentrations mediate a closure of stomatal pores in plants and conversely, low CO2 concentrations trigger opening of stomatal pores.

Detailed explanation-3: -Almost all water used for plant growth is lost to the atmosphere by transpiration through stomatal pores on the leaf epidermis. By altering stomatal pore apertures, plants are able to optimize their CO2 uptake for photosynthesis while minimizing water loss.

Detailed explanation-4: -Stomatal opening is essential for CO2 uptake for photosynthesis and stomatal closure is necessary to reduce transpiration, maintain plant water potential and prevent desiccation.

Detailed explanation-5: -They only open their stomata during the cool of the night to take up CO2. They then store this CO2 and use it in the daytime for photosynthesis. This way, they lose less water during the day because they can keep the stomata closed, but they can continue to grow-although a little slower than normal.