Living World (Year 10 exam condensed edition)

Rainforests

Deserts

Ecosysystems

Deforestation Impacts

Definitions

Ecosystem- the biotic (community) and abiotic factors which collaborate and work within a certain area

Community- All the biotic factors within an ecosystem

Species- a single animal or plant type within an ecosystem

Interdependence- The idea of species being closely linked with another, relying on each other for survival e.g predator, prey

Producers

Consumers

Make their own food via photosynthesis

The start of a food chain where the highest amount of energy and biomass is.

As

Eat other plant or animals to gain energy as food

Can be predators or prey

generally have to eat multiple organisms to gain enough energy to survive (since energy is lost through bodily processes)

Decomposers- organisms which secrete enzymes to decay dead organic matter, so that nutrients can be replenished in the soil and uptaken by plants.

Food chain/webs- show the transfer of energy between organisms (which organism eat the other)

Environmental

Economic

Loss of habitats- causing species to reduce in population / become extinct if unable to adapt

Less carbon capture- carbon dioxide released into the atmosphere (increasing emissions) and less trees to absorb carbon emissions leading to less mitigation of emissions

Business able to have more space to exploit (for cattle ranching and/or agriculture) - beef sales made >$600mn by exports from the Amazon.

Local communities can make money from selling rainforest?

Social

Local tribal communities forced to relocate or produce local scale farms to survive

High amounts of soil erosion for water washing away nutrient rich topsoil since there is no tree cover to intercept.

Desertification

Causes

Management strategies

Global warming dries soil so that it becomes dust like / less rainfall in desert areas

Soil erosion causes it to lose nutrients and become infertile

Over-grazing causes soil to become infertile

The Great Green belt- planting savanna suited trees to reintegrate wildlife on the verges of deserts / also act as windbreaks to mitigate soil erosion

Drip irrigation- manages water supplies so crops can grow in savanna areas and water is not wasted.

Solar technology uses the sunlight to power areas around deserts helping inhabitants have a good QOL.