Apical meristem
Embryonic plant tissue in the tips of roots and in the buds of shoots that supplies cells for
the plant to grow in length.
Apocarpous
Consisting of carpels that are free from one another as in buttercups or roses.
Apomorphic character
A derived phenotypic character, or homology, that evolved after a branch diverged from a
phylogenetic tree.
Apoplast
In plants, the nonliving continuum formed by the extracellular pathway provided by the
continuous matrix of cell walls.
Apoptosis
Programmed cell death brought about by signals that trigger the activation of a cascade of
"suicide" proteins in the cells destined to die.
Aposematic coloration
The bright coloration of animals with effective physical or chemical defenses that acts as a
warning to predators.
Aquaporin
A transport protein in the plasma membranes of a plant or animal cell that specifically
facilitates the diffusion of water across the membrane (osmosis).
Aqutic
Consisting of, relating to, or being in water; an aquatic environment.
Aqueous solution
A solution in which water is the solvent.
Arboreal
Tree-dwelling.
Archaea
One of two prokaryotic domains, the other being the Bacteria.
Arches
Arches are curved structures, arch-like in profile, which span the foot.
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