How many monosaccharides can form if this polysaccharide breaks up?

It depends on the type of polysaccharide. Normally, a polysaccharide is made up of more than 10 monosaccharides. I believe that it's up to a hundred monosaccharide that can form a branched chain of a polysaccharide. I hope that this helps :) sorry if it don't. 

When measuring an earthworm you would most likely have to go with centimeters

Only algae, oak trees, and bermuda grass produce atp by photosynthesis i am almost positive