Question

why, sometimes higher plants and animals too perform anaerobic respiration?

Answer 1

because of height there is pressure and amount of air is low at higher area. so sufficient air is not there. so anaerobic respiration happens

Answer 2

higher plants or animals too perfrom anaerobic respiration at a time when we would are not able to provide sufficient oxygen to body
the body need instant oxygen for energy
so it turns to aneaobic respiration