Ecosystems - Free MCQ Practice Test with solutions, Year 8 Science IGCSE

Stoats, introduced to control rabbits, became predators of native birds, causing the extinction of species like the laughing owl.

Flooding provides water for algae, breeding grounds for frogs and dragonflies, and supports the ecosystem’s biodiversity.

Ants collect seeds that fall to the ground and store them in their nests, sometimes allowing seeds to germinate later.

The saguaro cactus grows slowly and can live over 100 years. Its roots spread beneath the soil to absorb rainwater efficiently.

Kangaroo rats are nocturnal to avoid daytime heat and predators.

Kangaroo rats dig burrows, which helps aerate soil and contributes to nutrient cycling.

Bioaccumulation refers to chemicals like DDT building up in an organism’s body over time, affecting its health.

Sap beetles feed on nectar and pollen, aiding in pollination of cacti flowers.

Light enables plants to carry out photosynthesis, producing food for themselves and other organisms in the ecosystem.

Rocky soil in deserts provides minerals for plants and shelter for some animals like ground-nesting birds.