Master GCSE Biology

MS1:

- A community of living organisms and their physical surroundings (1)

MS2:

- Deforestation reduces the number of trees that absorb carbon dioxide from the atmosphere (1)

- Increased levels of carbon dioxide contribute to climate change (1)

MS3:

- Food webs are interconnected food chains that show the feeding relationships between organisms (1)

- They help prevent any species from becoming too dominant (1)

- They provide alternative pathways for energy flow in case of species loss or environmental changes (1)

MS4:

- Examples: temperature, light availability, soil pH (any three) (2)

MS5:

- Decomposers break down dead organisms and waste products (1)

- They recycle nutrients back into the soil to be used by plants (1)

MS6:

- Biodiversity refers to the variety of different species in an ecosystem (1)

- It ensures ecosystem stability and resilience to changes (1)

- Threat: deforestation, pollution (1)

MS7:

- Biomass = Total weight of individuals (500) x Average weight (2.5 kg)

- Biomass = 1250 kg (2)

MS8:

- Examples: reducing pollution, using renewable resources, managing waste (any three) (3)

MS9:

- A group of populations of different species living together in the same area (1)

MS10:

- Producers are the primary source of food, so their distribution determines where consumers can access their food (1)

- Consumers will be found in areas where producers are available (1)