A producer is an organism that makes its own food.

Biomass is the mass of living material in one or more organisms.

A trophic level is the position of an organism in a food chain diagram.

A pyramid of biomass is a diagram which shows the biological mass (biomass) of organisms at each trophic level in a food chain diagram.

The efficiency is how much of something is transferred compared to how much is available, e.g. how much biomass is transferred to a consumer compared to how much is available.

Transfers of biomass between trophic levels

Biology

Pupils learned about biotic and abiotic components of an ecosystem, measuring population size, interdependence and competition in ecosystems, how changes in biotic and abiotic factors affect communities, the cycling of carbon and water, and the role of microorganisms in cycling materials through ecosystems.

Maintaining biodiversity and human impacts

Urbanisation is the increase in the number of people living in towns and cities (urban areas).

Deforestation is the removal of trees; often to use for timber or fuel or to repurpose land for houses or farming.

Biodiversity is the range of different living organisms (species) that live in a place.

Greenhouse gases are gases that are responsible for the greenhouse effect by absorbing infrared radiation and trapping ‘heat’ in the atmosphere.

Climate change is a long term shift in weather patterns.

Negative human interactions with ecosystems and impacts on biodiversity

Biodiversity is the range of different living organisms that live in a place.

Fertiliser are minerals that are added to the soil to help plants to grow.

Eutrophication is the process in which a body of water is overly enriched with plant nutrients. This leads to excessive growth of simple plants such as algae.

Indigenous species are the species that occurs naturally in an ecosystem. They are sometimes referred to as native species.

Examples of human interactions with ecosystems, including use of peat

the range of different living organisms that live in a place

the benefits that nature provides to human wellbeing and quality of life

having enough food to feed the human population

when a resource is produced as quickly as it is removed from the environment so that it does not run out

the process of protecting biodiversity and the environment

Benefits and challenges of maintaining biodiversity

a gas responsible for the greenhouse effect by absorbing and re-radiating infrared radiation that warms the atmosphere

how many individuals of a species are present

the range of different living organisms (species) that live in a place

Impacts of environmental changes on the distribution of organisms 

modifying the genome of an organism by adding, removing or altering genes, to introduce a desirable characteristic (or remove an undesirable one)

the alteration and use of organisms to produce products for human use

whether an action taken is right or wrong

Maintaining biodiversity and human impacts

Choose a lesson (6)

Some of these lessons will soon be taken down.