Science Y9 revision

Producer → ….

Primary Consumer, Secondary, Tertiray

Food chains begin with

A producer that is usually a green plant

Environment

The conditions surrounding an organism

Habitat

Place where organisms live

Population

Individuals of a species living in a habitat

Community

Populations of different species living in a habitat

Abiotic

Non-living

Biotic

Living

Competition

Plants in a community or habitat compete with each other for light, space, water and mineral ions

Factors affecting food security

Increasing birth rate, conflicts, environmental changes etc.

Global warming effects

Temp rise damages habitats, extreme weather harms populations of plants and animal

Decomposers break down…

Dead plants and animal matter by secreting enzymes

Trophic Levels

Level 1 - Producers, Level 2 - Herbivores, Level 3 - Carnivores, Level 4 - Carnivores

Deforestation reduces…

Biodiversity and removes a sink for increasing the amount of co2 in the atmosphere

Quadrats

Organisms are counted within a randomly placed square

Transects

Organisms are counted along a belt of the ecosystem

Fossil Fuel

Coal, oil and natural gas that are extracted from the Earth and burned

Non-Renewable

This is a resource that is replenished slower than the rate as which is used

Renewable

This is a resource that is replenished at the same rate it is used

Biofuel

A fuel taken from living or recently living things

Advantage of solar power?

Don’t produce greenhouse gases

Disadvantage of geothermal energy?

Expensive

Density = ?

Mass / Volume (KG/M³)

Sublimation

Solid → Gas

Carbon Monixde Effects

Toxic, colourless and odourless

Sulfur dioxide and oxides of nitrogen Effects

Cause respiratory problems in humans and acid rain

Particulates Effects

Global dimming and health problems in humans

Climate Change Effects

Rising Sea levels, extreme weather, change in amount of rainfall and changes to distribution of wildlife species

Algae and plants produce…

Oxygen through photosynthesis

Examples of greenhouses gases (CD, WV and M)

Carbon Dioxide, Water Vapour and Methane

John Dalton said

Atoms were solid spheres

JJ Thompson said

Atoms were a positive mass containing negative electrons in it (Plum Pudding)

Rutherford said

Atoms was a positive nucleus surrouned by negative electrons

Bohr said

Atoms were electrons orbited in shells

Isotopes

Atoms of the same element with the same number of protons and different numbers of neutrons

Mixtures

Two or more elements or compounds not chemically combined together