Test: Population change - Year 9 MCQ

Changes in population size can be influenced by various factors such as availability of resources like food and habitat, predation, and environmental changes including climate change.

Carrying capacity refers to the maximum population size that a particular environment can sustain indefinitely, given the available resources.

Habitat destruction decreases the available resources and space, thereby reducing the carrying capacity of the environment and impacting population dynamics.

Endangered species are those that are at risk of extinction due to factors like habitat loss, overhunting, or environmental changes.

Extinct species no longer exist on Earth, while endangered species are those facing a high risk of extinction but still exist.

Conservation strategies include restoring and protecting habitats, implementing breeding programs, and reducing human impacts such as pollution and illegal trade.

Keystone species play a crucial role in maintaining the structure and function of an ecosystem, often exerting influence disproportionate to their abundance.

Human activities such as deforestation, pollution, overexploitation of resources, and climate change contribute significantly to biodiversity loss.

Population growth rate refers to the rate at which a population increases over a specified period, considering births, deaths, and migration.

Invasive species can negatively impact native populations by outcompeting them for resources such as food and habitat, leading to declines in native species.