What's the relationship between monosaccharides and polysacharides, and does the quantitative analysis of monosaccharides tell us something about polysaccharides?
Plants produce monosaccharides by photosynthesis. Subsequently, they convert them into polysaccharides either for obtaining structural material (e. g. cellulose) or energy reserves (e. g. starch). There are also events when plants hydrolyse polysaccharides back into oligo- or monosaccharides (e. g. riping of fruits). Therefore, no constant ratio of mono- to polysaccharides exists - especially not over all plant species. You'll have to quantify both fractions, if you need this information. You can do this hydrolysing the plant sample and compare it with an unhydrolysed plant extract.
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