In article ,
Steve Turner wrote:
Steve Turner wrote:

Respiring plants are a new one on me.

I take it back. There must be some mechanism for plants to utilize
oxygen. However, it seems to be a minor process compared with
photosynthesis.

Plants have all the stuff you find in other eukaryotic cells, mitochondria
and all the rest. Obviously, root cells aren't exposed to sunlight, yet
they metabolize and grow, powered by sugars translocated from above ground.
Green cells in plants have chloroplasts, in which photosynthesis takes place.
From there on, it's like animal, fungal, protist (or whatever they are called
now) cells all the way.

All that "how to be a cell and do cell things" DNA is very standardized.
It's really close to the same in barley, yeast and beer drinkers. They
all run on glucose, but they obtain it in different ways.