TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Components: The genetically modified plant or algae is genetically modified kelp, seaweed, microalgae, macroalgae, maize, wheat, rice, barley, soybean, cotton, Sorghum, sweet, oats, tobacco, Miscanthus, switchgrass, Alfalfa, rye, sugarcane, sugar beet, corn, or their byproducts. The polysaccharide-degrading enzyme is chosen from amylase, protease, pullulanase, isoamylase, cellulase, hemicellulase, xylanase, cyclodextrin glycotransferase, lipase, phytase, laccase, oxidase, peroxidase, esterase, cutinase, pectinase, glucuronidase, amyloglucosidase, glucoamylase, starch debranching enzyme, glucanase, glucosidase, arabinases, arabinosidase, galactanase, galactanase, galactosidase, mannanase, mannosidase, xylosidase, fucosidase, rhamnosidase, levanase, inulanase, and their combinations. Preferred Method: The genetic modifications comprise a heterologous polynucleotide encoding one or more heterologous polysaccharide-degrading enzymes. At least one genetic modification enables genetically modified plant or algae to grow faster than an unmodified plant or algae of the same species, where the genetically modified plant enables to grow a larger root structure. At least one genetic modification alters the chemical composition of the genetically modified plant or algae in comparison to an unmodified plant or algae of the same species. The hydrolase enzymes comprise an enzyme that catalyzes the hydrolysis of an oligomeric sugar target. The genetically modified plant or algae comprises more cellulose, hemicelluloses and lignin/g of mass than the unmodified plant or algae. The genetic modifications increases genetically modified plant or algae's resistance to stress in comparison to an unmodified plant or algae of the same species. The stress is dehydration, heat, or cold. At least one of genetic modifications results in altered expression and/or activity of proteins involved in cell wall degradation. Preferred Microorganism: The microorganism, preferably mesophilic microorganism is bacteria, yeasts, non-yeast fungi, or their combinations, where at least one of microorganisms are capable of fermenting C5 and C6 carbohydrates, and hydrolyzing and fermenting hemicellulosic or lignocellulosic material, hexose and pentose oligosaccharides. The microorganism is Clostridium. The microorganisms are genetically modified to have altered expression of one or more hydrolase enzymes. The Clostridium is chosen from Clostridium phytofermentans, Clostridium sp. Q.D, C.algidixylanolyticum, C.xylanolyticum, C.cellulovorans, C.cellulolyticum, C.thermocellum, C.josui, C.papyrosolvens, C.cellobioparum, C.hungatei, C.cellulosi, C.stercorarium, C.termitidis, C.thermocopriae, C.celerecrescens, C.polysaccharolyticum, C.populeti, C.lentocellum, C.chartatabidum, C.aldrichii, C.herbivorans, or their variant. Preferred System: The system further comprises an external source of one or more enzymes that is capable of enhancing hydrolysis. EXAMPLE - No suitable example given.