Stoma

Stoma

Intermingled with these ordinary epidermal cells are guard cells. They exist in pairs and provide a small opening or stoma for the exchange of CO2, O2 and H2O vapors. Often these outer surfaces of the epidermal cells have a waxy protective substance called cutin. Usually the upper epidermal layer has fewer guard cells than the lower layers and a thicker cutin layer.

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Part of Speech: noun
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Industry/Domain: Plants
Category: Horticulture
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stoma

Natural environment; Coral reefs

Any of various small openings or pores in an animal body, especially an opening resembling a mouth in many invertebrates; also a minute pore in the epidermis of the leaf or stem ...

stoma

Biology; Cell biology

A tiny opening or pore in the surface of a plant leaf. A stoma allows gases and water to pass into and out of a plant.

stoma

Biotechnology; Genetic engineering

1. Any of various small openings or pores in an animal body, especially an opening resembling a mouth in various invertebrates. 2. Botany: A minute pore in the epidermis of the ...

stoma

Plants; Botany

A pore; a pore in the epidermis of a leaf or other aerial organ, providing access for gaseous exchange between the tissues and the atmosphere. Pl. Stomata.

stoma

Plants; Plant pathology

Structure composed of two guard cells and the opening between them in the epidermis of a leaf or stem, functioning in gas exchange.

stoma

Medical; Gastroenterology

An opening in the abdomen that is created by an operation (ostomy). It is usually covered by an external pouch that collects stool. A pouch is not needed for a continent ...

bark

Plants; Horticulture

The rough outer part of the cortex; loosely used for the entire cortex.

articulate

Plants; Horticulture

Having nodes or joints where separation may naturally occur.

annular

Plants; Horticulture

Ring-like; said of leaf scars that encircle the bud, or bundle scars that are circular with an opening in the center.

Plants; Horticulture

On the front side, away from the axis, toward the subtending bract.

aphid

Plants; Horticulture

a small green or white insect that sucks juices from plant parts

apomixis

Plants; Horticulture

process of producing viable seed without fertilization

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