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- a PLASTID which lacks CHROMATOPHORES. The adjective apoplastic is applied to individual protozoans that lack colour in a group which is generally coloured. Apoplasty occurs when cell division is so fast as to outpace plastid division, producing individuals which are formed without plastids.
- those areas of the plant that are outside the SYMPLAST, comprising the parts outside the PLASMALEMMA, such as cell walls, intercellular spaces and the dead tissues of XYLEM.