Chapter 19 - Human Effects on Ecosystem

Wild fisheries

Located in the oceans, lakes and rivers, where fish has to be captured or fished.

Fossil fuels

Formed from the fossilised remains of dead plants and animals.

Trees

Contribute to humidity by transpiration and extract groundwater through their roots to be released into the atmosphere.

Sludge

Undergoes a process of bacterial digestion to reduce the amount of organic matter and the number of disease- causing microorganisms present.

Green plants

Convert atmospheric carbon dioxide into glucose during photosynthesis.

pollution

They are prone to overfishing and ________, which could lead to an imbalance in the ecosystem.

Conservation

The act of protecting species, their habitats and entire ecosystems from extinction.

Carbon dioxide

The gas returned to the atmosphere when cellular respiration takes place in living organisms.

solid matter

The ________ left behind from the sewage treatment process is known as sludge.

Pollution

The contamination of the environment causing harm and damage to the ecosystem.

green plants

When the ________ and animals die, decomposers break their organic matter down into carbon dioxide and other simple substances.

deforestation

The process of clearing forests for timber and land

decomposers

Break the dead organic matter down into carbon dioxide and other simple substances.