guard cell - definitie. Wat is guard cell
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Wat (wie) is guard cell - definitie

ONE OF A PAIR OF CRESCENT-SHAPED CELLS THAT SURROUND A PLANT'S STOMA; CHANGES IN THE TURGIDITY OF THE CELLS CAUSE THE OPENING AND CLOSING OF THE STOMA.
Guard cells; Gaurd Cells
  • Opening and Closing of Stoma.

guard cell         
¦ noun Botany each of a pair of curved cells that surround a stoma.
Guard cell         
Guard cells are specialized plant cells in the epidermis of leaves, stems and other organs that are used to control gas exchange. They are produced in pairs with a gap between them that forms a stomatal pore.
Guard (computer science)         
BOOLEAN EXPRESSION EVALUATED TO DETERMINE IF A BRANCH OF A COMPUTER PROGRAM SHOULD CONTINUE TO BE EXECUTED
Guard statement; Pattern guard; Guard statements; Guard (computing); Guard clause; Guard pattern
In computer programming, a guard is a boolean expression that must evaluate to true if the program execution is to continue in the branch in question.

Wikipedia

Guard cell

Guard cells are specialized plant cells in the epidermis of leaves, stems and other organs that are used to control gas exchange. They are produced in pairs with a gap between them that forms a stomatal pore. The stomatal pores are largest when water is freely available and the guard cells turgid, and closed when water availability is critically low and the guard cells become flaccid. Photosynthesis depends on the diffusion of carbon dioxide (CO2) from the air through the stomata into the mesophyll tissues. Oxygen (O2), produced as a byproduct of photosynthesis, exits the plant via the stomata. When the stomata are open, water is lost by evaporation and must be replaced via the transpiration stream, with water taken up by the roots. Plants must balance the amount of CO2 absorbed from the air with the water loss through the stomatal pores, and this is achieved by both active and passive control of guard cell turgor pressure and stomatal pore size.