Plants and their ways in South Africa . ed in starch paste orin a solution of cane sugar an enzyme excreted by the yeastsets up a digestive process. Starch uniting chemically withwater (by hydrolysis) becomes changed into maltose iS^i^^fiu)which by union with another molecule of water breaks up intotwo molecules of glucose thus : — C„H,,0„ + H,0 = 2(C„H,,0,;).Maltose Glucose Classification of Plants 223 Cane sugar by taking up a molecule of water breaks upinto a molecule of grape sugar (glucose) and fructose :— ^12^^22 On + HP = CaHj. 0« + C, HiPg. After this change outside the yeast cells has
Plants and their ways in South Africa . ed in starch paste orin a solution of cane sugar an enzyme excreted by the yeastsets up a digestive process. Starch uniting chemically withwater (by hydrolysis) becomes changed into maltose iS^i^^fiu)which by union with another molecule of water breaks up intotwo molecules of glucose thus : — C„H,,0„ + H,0 = 2(C„H,,0,;).Maltose Glucose Classification of Plants 223 Cane sugar by taking up a molecule of water breaks upinto a molecule of grape sugar (glucose) and fructose :— ^12^^22 On + HP = CaHj. 0« + C, HiPg. After this change outside the yeast cells has taken place(extracellular digestion), the simple sugars are taken into theyeast cell. Here it meets with an enzyme which cannot passout of the cell. This enzyme disorganizes these sugars, where-upon oxygen which was driven away from the carbon when itwas first formed, now recombines with it forming CO2. Notall the carbon is oxydized, but the sugar is broken down intocarbonic acid gas and alcohol:— CeHiaOg = 2C2H6O + 2 CO,. Fig. 196.—Spore print of a Mushroom. (Printed and photographed by MissEthel M. Doidge.) In preparation of the Kaffir beer Leting, Miss Doidge hasfound that a mould (Mucor) effects the change from starch tosugar and can also ferment some of the sugar, forming somealcohol. When the Leting is fresh a bacterium causes an acidfermentation of the starch of the Kaffir corn thus producing avery wholesome drink which is not intoxicating. Many of the rusts live part of their life as parasites on onehost while to complete their life-history quite another host isnecessary. 224 Plants and their Ways in South Africa Where do Mushrooms Bear their Spores?—Cut off the stem of a common Mushroom. Lay the cap carefullyon a sheet of paper, gills downwards. After several hoursthere will be a pretty spore print on the paper. The finepowder is the spores. When the spores lodge in a place withsuflficient moisture, they send out delicate white threads, whichgrow most
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplants, bookyear1915
