biology-dictionary_11-06-2009

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Stolons
An above ground prostrate stem that develops roots and leaves at nodes along its length,
e.g. couch grass.
Stoma
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.
Stomatal apparatus
A surgically constructed opening, especially one in the abdominal wall that permits the
passage of waste after a colostomy or ileostomy.
Stomatal complex
A small aperture in the surface of a membrane
Stomochord
A hollow pouch of the gut found in the proboscis of hemichordates.
Storage parenchyma
The tissue characteristic of an organ, as distinguished from associated connective or
supporting tissues.
Strategy
A group of related traits, evolved under the influence of natural selection, that solve
particular problems encountered by living organisms; often includes anatomical,
physiological, and behavioral characteristics.
Striated muscle
Skeletal voluntary muscle and cardiac muscle. The name derives from the striped
appearance, which reflects the arrangement of contractile elements.
Strict aerobe
An organism that can survive only in an atmosphere of oxygen, which is used in aerobic
respiration.
Strict anaerobe
An organism that cannot survive in an atmosphere of oxygen. Other substances, such as
sulfate or nitrate, are the terminal electron acceptors in the electron transport chains that
generate their ATP.

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