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WORLD OF PLANTS PowerPoint Presentation
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WORLD OF PLANTS

WORLD OF PLANTS

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WORLD OF PLANTS

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  1. WORLD OF PLANTS • Many uses for plants: • - (a) Source of food • - (b) Medicines (25% have plant material) • Poppy plant - morphine for pain relief • Foxglove - digitoxin for heart disease • Penicillium (fungus) - antibiotic Penicillin • - (c) Raw Materials (e.g timber, cotton)

  2. Plants for food • Can you think of examples where the following parts are edible: • - leaves • - roots • - fruits • - beans/seeds • - stems • - flowers

  3. Specialised Plants • Cotton • - Seed oil & protein used for animal feed • - Fibres used to make cloth • Seaweed (produce alginates) • - for gels, thickeners, emulsions • - useful for toothpaste, jelly, handcream, clingfilm, ice cream ……..

  4. Future use of Plants • Food Sources • 20 plants feed 90% of world population • BUT: over 75,000 edible plants exist • Some could be used to replace basic crops (rice, potato) • Genetic Storehouse • Wild plants can be bred with domestic plants • e.g. wild corn (resistant to disease) + domestic corn (high food yield)= perfect crop

  5. Timber Production • Conifer Trees grown for their timber • - Land Preparation: • High sloping land used. Drainage trenches dug. • - Planting & Managing: • Young nursery trees planted in rows • All weeds cleared • Poor growing trees removed (‘thinning’) • Lower branches pruned • Pesticides used for disease

  6. Timber Production • After 50 years: • Harvesting & Marketing: • - Scots pine - telegraph poles, chip-board, paper etc. • - Norway spruce - furniture-making, interior joinery

  7. Future use of Plants (ctd.) • Medicines: • Over 2000 plants might be useful for medicines (anti-cancer or antibiotics) • Only 40 plant species currently used • New drugs have to go through trials: • human cells • animals • human volunteers