Study Notes
The organism in the environment involves understanding how organisms interact with each other and their surroundings. Key terms include populations, communities, habitats, and ecosystems.
- Population — a group of organisms of the same species living in the same place at the same time. Example: A population of deer in a forest.
- Community — all the populations living in the same area at the same time. Example: Deer, birds, and insects living together in a forest.
- Habitat — the place where an organism lives. Example: A woodland habitat for badgers and oak trees.
- Ecosystem — all the biotic and abiotic factors that interact within an area at one time. Example: A garden pond or the whole of Antarctica.
- Biotic factors — living components such as plants and animals. Example: Availability of food and new predators.
- Abiotic factors — non-living components such as light intensity and temperature. Example: Light intensity needed for photosynthesis.
- Biodiversity — the range and variety of different species of organisms on Earth or within an ecosystem. Example: High biodiversity in a rainforest with many different species.
Exam Tips
Key Definitions to Remember
- Population
- Community
- Habitat
- Ecosystem
- Biotic factors
- Abiotic factors
- Biodiversity
Common Confusions
- Mixing up biotic and abiotic factors
- Confusing population with community
Typical Exam Questions
- What is a population? A group of organisms of the same species living in the same place at the same time.
- How does light intensity affect plant growth? It affects the rate of photosynthesis, leading to increased plant growth.
- Why is biodiversity important? It ensures ecosystem stability by reducing dependence on one species.
What Examiners Usually Test
- Understanding of key terms like population and community
- Effects of abiotic factors on ecosystems
- Importance and impact of biodiversity