Stomata

Stomata 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.

Stomata begin as stomatal meristemoids. The process varies between dicots and monocots.

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 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 -- 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.

stomatal index = (number of stomata per mm2 × 100)/(number of stomata per mm2 + number of epidermal cells per mm2). This value has been found useful in comparing leaves of different sizes.

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. Categories: Plant physiology ...

Merostomata The class of arthropods whose members are aquatic and possess book gills on the opisthosoma. Eurypterids (extinct) and horseshoe crabs.

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) 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 (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.

The plant solution to gas exchange is a new structure, the guard cells that flank openings (stomata) 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 stomata.

(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.

A process that reduces the yield of photosynthesis, because the active site of rubisco accepts O2 in place of CO2 and generates no ATP. This usually occurs on hot, dry days when stomata are closed and the O2 concentration in the leaf exceeds that of ...

transpiration Passage of water from the roots of a plant to the atmosphere via the vascular system and the stomata of the leaves. transporters Proteins that span a membrane and transport specific molecules across the membrane.

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