Study Notes
Food production involves optimizing conditions for crop growth and managing resources effectively to increase yields.
- Limiting Factor — a condition that limits the rate of photosynthesis when in short supply. Example: Light intensity can be a limiting factor if it is too low.
- Glasshouses — structures that allow control of environmental conditions to enhance plant growth. Example: Glasshouses can increase temperature and CO2 levels to boost photosynthesis.
- Fertilisers — substances added to soil to provide essential nutrients for plant growth. Example: Nitrogen fertilisers help plants grow by providing nitrates needed for protein synthesis.
- Pesticides — chemicals used to kill pests that damage crops. Example: Insecticides are used to eliminate insect pests.
- Biological Control — using natural predators to manage pest populations. Example: Ladybirds can be introduced to control aphid populations.
- Fish Farming — raising fish in controlled environments to increase food supply. Example: Fish farms use selective breeding to produce fast-growing fish.
Exam Tips
Key Definitions to Remember
- Limiting Factor
- Glasshouses
- Fertilisers
- Pesticides
- Biological Control
- Fish Farming
Common Confusions
- Confusing limiting factors with environmental factors
- Misunderstanding the role of glasshouses versus polythene tunnels
Typical Exam Questions
- What is a limiting factor in photosynthesis? A limiting factor is a condition that restricts the rate of photosynthesis when in short supply.
- How do glasshouses increase crop yields? Glasshouses control temperature, light, and CO2 levels to optimize photosynthesis.
- Why are fertilisers important in agriculture? Fertilisers provide essential nutrients that enhance plant growth and increase yields.
What Examiners Usually Test
- Understanding of how limiting factors affect photosynthesis
- Knowledge of methods to increase crop yields
- Differences between chemical and biological pest control