1. Lacking elasticity; unyielding or unadaptable. See Synonyms at stiff. 2. Economics Of, relating to, or being a good for which changes in price have little effect on the quantity demanded or supplied: the inelastic demand for cigarettes.
The classification of algae is complex and somewhat controversial, especially concerning. the blue-green algae (Cyanobacteria), which are sometimes known as blue-green. bacteria or Cyanophyta and sometimes included in the Chlorophyta. These topics are. not covered in detail this document.
The algae are a polyphyletic and paraphyletic group of organisms. They are defined in differing ways, but are usually considered to be the photosynthetic organisms excepting plants.Using the term 'plants' in its most restrictive fashion, the algae are then photosynthetic organisms excepting the sister group to the Charales (i.e. the land plants).Such a definition allows inclusion of photosynthetic prokaryotes such as the cyanobacteria.hey are defined in differing ways, but are usually considered to be the photosynthetic organisms excepting plants. Using the term 'plants' in its most restrictive fashion, the algae are then photosynthetic organisms excepting the sister group to the Charales (i.e. the land plants).