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What is the role of open vs closed stomata in regulating gas exchange in plants?
Open stomata allow for the exchange of gases, such as carbon dioxide and oxygen, between the plant and the environment. Closed stomata restrict this exchange, helping to regulate the amount of water loss and gas exchange in plants.
Plants that fix CO2 into organic acids at night when the stomata are open and carry out the Calvin cycle during the day when the stomata are closed are called?
Plants that fix CO2 into organic acids at night when the stomata are open and carry out the Calvin cycle during the day when the stomata are closed are called CAM (Crassulacean Acid Metabolism) plants. CAM plants have adapted their carbon fixation process to avoid water loss during the day by keeping stomata closed, and perform photosynthesis during the night when conditions are cooler and less water loss occurs.
Can a plant makes food if the stomata is closed?
No, plants require open stomata to take in carbon dioxide for photosynthesis. Without the exchange of gases through the stomata, the plant cannot produce food efficiently.
Why do a leafs stomata open and close?
Changes in the osmotic potential of gaurd cells make that stomata open or closed
How many stomata are likely to open at night?
In most green plants the stomata are only open during the day. They allow carbon dioxide to reach the cells where the majority of photosynthesis takes place. As they also allow transpiration (water loss) the stomata of most plants close during the night when photosynthesis is not possible. There is a group of mainly desert plants known as CAM plants. These carry out a process called Crassulacean acid metabolism, which effectively allows them to store carbon dioxide in their leaves. In these plants the stomata are normally closed during the day to prevent water loss when temperatures are high, and open during the night when temperatures are lower.
What happens to the oxygen produced by the Calvin cycle in CAM plants during the day, when their stomata is closed?
It is widely known that CAM plants open their stomata at night time to fix the CO2 in form of organic acids. However, during the light reactions in daytime O2 is evolved while the stomata are closed and there is no way out. The question goes to the possible mechanism by which these plants can handle this high oxygen level during the daytime, while the stomata are closed. Do these plants have an oxygen accumulation and release system like that of CO2? Is such a mechanism studied or described elsewhere?
How do gases enter and leave plants?
In terrestrial plants, gas enters and leaves (termed "gas exchange") through cell-lined pores called "stomata." Stomata open and close in response to light and humidity, permitting oxygen, carbon dioxide and water vapor to enter and leave the plant. In most terrestrial plants, the stomata are located on the surface of the leaves, or in cacti, on the surface of the stems. In aquatic plants, gas exchange directly though the tissue surface.
Why don't plants keep their stomata open all time?
Plants don't keep their Stomata open all the time to prevent too much water loss.
Will the stomata of a wilted plant be open or closed?
it is closed so no further water can be lost
Where do c4 and cam plants store co2?
C4 plants store CO2 in the mesophyll cells, where initial carbon fixation occurs using PEP carboxylase. CAM plants store CO2 in vacuoles within their cells during the night, when stomata are closed, and use it during the day for photosynthesis when stomata are open.
What are some differences between xerophyte and phreatophyte?
Xerophytes are known for having stomata that are fewer in number, sunken, waxy and\or open only at night. Hydrophytes often lack cuticle, because there is no need to prevent water loss. stomata are larger in quantity and typically open.
Why does the stomata of a desert plant close during the day?
In desert plants, the stomata is open during night. During night, desert plants (also called xerophytes) absorb co2 and form an intermediate. Then during day time when the stomata is closed to prevent loss of water, they use this stored carbon dioxide to perform photosynthesis.
