Stomata reveal past carbon dioxide levels
Because CO2 levels and stomatal index are inversely related, could fossil leaves tell us about past levels of CO2 in the atmosphere? Yes.
and CO2 Concentration
(singular stoma) are microscopic openings on the undersurface of leaves that allow gas exchange and water evaporation from inside the leaf.
stomata the pores within leaves surrounded by guard cells that regulate the rate of gas exchange, which regulates the rate of photosynthesis. (Singular, stoma.) ...
and Gas Exchange
, as mentioned above, are the structures through which gas exchange occurs in leaves. Each stoma is surrounded by two guard cells, which can open and close depending on environmental conditions.
Gnathastomata: Jawed vertebrates, evolved following the jawless vertebrates (Class Agnatha). The oldest extant branch of jawed vertebrates is the cartilaginous fish.
 as pathogenic pathways
are an obvious hole in the leaf by which, as was presumed for a while, pathogens can enter unchallenged.
stoma pl. stomata
A microscopic pore surrounded by guard cells in the epidermis of leaves and stems that allows gas exchange between the environment and the interior of the plant.
stoma (pl ) /STŌ-mə, stō-MAWT-ə/ n. Microscopic pores in the epidermis of plants; allow gas exchange with the atmosphere.
Stomatal opening and closing depends on changes in the turgor of the guard cells. When water flows into the guard cells by osmosis, their turgor increases and they expand.
open up during the day to let CO2 in and inadvertently let H2O escape ...
Stomata open when guard cells actively accumulate K+ into the vacuole.
This decreases water potential in guard cells, leading to an inflow of water by osmosis and increasing cell turgor.
openings in the epidermis of a stem or leaf of a plant which permit gas exchange with the air.
Style the narrow stalk of the pistil, located above the ovary but below the stigma.
The stomata leave clearly visible impressions in the nail varnish. A graticule slide allows for the counting of how many stomata (per unit area) are on the leaf surface, a characteristic of physiological significance.
See more about: Stoma ...
Mero The class of arthropods whose members are aquatic and possess book gills on the opisthosoma. Eurypterids (extinct) and horseshoe crabs.
The class Merostomata contains the extinct "sea scorpions" (or eurypterids) and the extant (living) horseshoe crabs. Eurypterids are extinct, but were important elements of faunas 200-500 million years ago during the Paleozoic Era.
In leaves, dermal tissue contains specialized cells called guard cells that make up structures called . facilitate the exchange of gases in the leaf.
Microscopic pores known as stomata are the only breaches in the otherwise continuous layer of the leaf epidermis. Each individual pore, or stoma, is, in fact, a small opening between a pair of specialized cells known as guard cells.
stoma (plural: ). Natural opening in a leaf surface that serves for gas exchange and water evaporation and has the ability to open and close in response to environmental conditions.
5) CAM physiology - Stomata open during the evening/night instead of during the day (when the temperature is at its highest) as the transpiration rate will be lower during cooler hours.
The plant solution to gas exchange is a new structure, the guard cells that flank openings () in the above ground parts of the plant. By opening these guard cells the plant is able to allow gas exchange by diffusion through the open .
(Science: botany) the loss of water by evaporation in terrestrial plants, especially through the stomata (accompanied by a corresponding water uptake from the roots); ...
small opening such as found in leaves; plural,
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
Gas exchange in complex plants occurs through the stomata (open pores) on the underside of the leaves. Carbon dioxide enters and oxygen leaves via these pores.
Transpiration: The loss of water vapor from a plant to the outside atmosphere, mainly through the of leaves and the lenticels of stems.
More Biology Terms ...
In animals, the passage of watery vapour from a living body through a membrane. Different from sweat, or perspiration which is the secretion of a saline solution of of the body.
In plants, the passage of water through the stomata of leaves.
Between their edges, at various points of their meeting, roundish dark spots are sometimes seen, which have been described as , though they are closed by intercellular substance.
It can cause the dormancy that's involved in helping plants slow down for things like winter. And they're involved in helping close the stomata, the openings that plants use everyday to allow carbon dioxide in and oxygen out of the plant.
See also: Stoma, Plant, Trans, Cells, Organ