16996297
Description
Flashcards by Ellie Potellie, updated more than 1 year ago
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Created by Ellie Potellie
almost 7 years ago
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| Question | Answer |
| What Can Reduce Crop Productivity? | •Weeds compete with crop plats •Pest & Diseases damage crop plants |
| What Properties Do Annual Crops/Plants Have? | •Rapid Growth •Short life cycle •High seed output •Long term seed viability |
| What Properties Do Perennial Crops/Plants Have? | •Storage organs •Vegetative propagation [Asexual Reproduction] |
| What Pests Can Affect Crop Production? | •Molluscs (Snails) •Nematodes (Worms) •Invertebrates (Insects) |
| What Are The Causes Of Plant Diseases? | •Fungi •Bacteria •Viruses |
| What Methods Can Control Weed Growth? | Weeds can be controlled using cultural methods; ploughing, weeding & crop rotation |
| What Do Selective Pesticides Do? | Selective Pesticides only affect particular organisms |
| What Do Systemic Pesticides Do? | Systemic Pesticides are absorbed & transported through the organisms vascular system, this can kill the plant |
| What Are Problems That Arise With The Use Of Pesticides | •Toxicity to non-target species •Persistence in the environment •Bio accumulation •Bio-magnification •Resistant pest production |
| What Is Bio Accumulation? | The build up of a chemical in an organism |
| What Is Bio Magnification? | An increase in concentration of a chemical between tropic levels |
| What Is Biological Control? | When the control agent is a natural predator of the pest ie Ladybug to greenfly |
| What Are The Risks Of Biological Control? | •Introduced organism may become an invasive species •Organism may contain a pathogen that spreads to other species |
| What Is Integrated Pest Management? | Combination of biological, chemical & cultural methods |
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