guard cells -- Pair of cells which surround a stomate and regulate its size by altering their shape.
gymnosperm -- n. A plant that produces seeds, which are not enclosed; includes any seed plant that does not produce flowers.
Guard cell
Guttation
Gymnosperm - A type of plant that bears seeds not enclosed by any type of specialized structure. Conifers are examples of gymnosperms.
guard cell Leaf epidermal cells that open and close to let water, oxygen, and carbon dioxide pass through the stomata.
gum A sticky, water-soluble plant secretion that hardens on contact with air.
Transpiration of water on the leaf and stem surfaces will cause the stomata's guard cells on the undersides of the leaves to close to protect water resources; if sufficient watering of the tree is not maintained, as a result, the leaves curl, dry up, ...
Stoma- A pore in the epidermis and the two guard cells surrounding it. Sometimes applied only to the pore.
Stool- A living stump capable of producing sprouts.
of the minute openings in the epidermis of leaves, stems, and other plant organs through which gaseous interchange between the atmosphere and the intercellular spaces within these structures occur; the opening together with its associated guard cells ...
 See also: Leaf, Plant, Stoma, Flower, Stomata
  
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