Summary
Photosynthesis is an endothermic reaction where plants use sunlight to convert carbon dioxide and water into glucose and oxygen. Crop yield can be improved through selective breeding, which involves choosing plants with desirable traits to reproduce.
- Photosynthesis — the process by which plants manufacture carbohydrates from raw materials using energy from light.
Example: Plants use sunlight to convert carbon dioxide and water into glucose and oxygen. - Autotrophs — organisms that can make complex molecules from simple molecules.
Example: Green plants producing glucose from carbon dioxide and water. - Selective Breeding — selecting individuals with desirable characteristics to breed together.
Example: Breeding plants for increased crop yield or disease resistance.
Exam Tips
Key Definitions to Remember
- Photosynthesis: process by which plants make carbohydrates using light energy
- Autotrophs: organisms that produce their own food
- Selective Breeding: breeding for desirable traits
Common Confusions
- Photosynthesis only occurs in green parts of plants, not in roots
- Artificial selection is not the same as natural selection
Typical Exam Questions
- What is the word equation for photosynthesis? Carbon dioxide + water → glucose + oxygen
- How does light intensity affect photosynthesis? Increased light intensity increases the rate of photosynthesis
- What is selective breeding? Selecting and breeding plants with desirable traits
What Examiners Usually Test
- Understanding of the photosynthesis process and its equation
- Factors affecting the rate of photosynthesis
- Differences between natural and artificial selection