This IVP is a stiff system of 8 non-linear Ordinary Differential
Equations.
The problem originates from plant physiology
and describes how light is involved in morphogenesis. To be
precise,
it explains the `High Irradiance Responses'
(HIRES) of photomorphogenesis on the basis of phytochrome, by means
of a chemical reaction involving eight reactants.
A complete description of the problem could be found in
hires.pdf
