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Stomata

Biology  Stomach  Stop codon
04/17/2014

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.


stomata -- Openings in the epidermis of a stem or leaf of a plant which permit gas exchange with the air. In general, all plants except liverworts have stomata in their sporophyte stage.

Stomata and CO2 Concentration
Stomata (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.) ...

Stomata and Gas Exchange
Stomata, 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.

[edit] Stomata as pathogenic pathways
Stomata are an obvious hole in the leaf by which, as was presumed for a while, pathogens can enter unchallenged.

(5) Stomata (singular, stoma)
(a) The trouble with a waxy cuticle is that along with waterproofing comes air-proofing ...

stoma pl. stomata
[Gk. mouth]
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.
strategy ...

stoma (pl stomata) /STŌ-mə, stō-MAWT-ə/ n. Microscopic pores in the epidermis of plants; stomata 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.

Stomata 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.
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Merostomata 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 stomata . Stomata 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: stomata). 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.

(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, stomata
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 stomata 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 stomata, though they are closed by intercellular substance.

See also: See also: Stoma, Plant, Trans, Cells, Organ

Biology  Stomach  Stop codon
04/17/2014

 
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