as leaves start to
lose their green colors in fall at autumn
senescence they can no longer do
photosynthesis.
When leaves are irradiated by
excess light energy, the chloroplasts that carry out photosynthesis
can easily suffer oxidative stress and stop photosynthesizing.
the photosynthesis shuts down at
noon, or at the peak of the hottest hours of the day, because too
much energy from the sun can damage biological structure.
In flood high water stress, due to
closure of stomata and halted water absorption stops
ohotosynthesis.