Changes in Ecosystems and Environments Quiz

How many hours do pandas spend eating daily?

• 12 hours

• 5 hours

• 8 hours

• 15 hours

Answer explanation

Pandas spend about 12 hours a day eating, primarily due to their diet of bamboo, which is low in nutrients. This extensive eating time is necessary for them to meet their energy needs.

During a class discussion, Aria and Noah were asked about a major external factor affecting plant and animal populations. What could be a significant factor they might consider?

• Human activity

• Climate change

• Natural disasters

• Predation

Answer explanation

Human activity significantly impacts plant and animal populations through habitat destruction, pollution, and climate change. While other factors like climate change and natural disasters are important, human activity is a direct and major influence.

What is happening to the panda population in China?

• It is dwindling

• It is increasing

• It is stable

• It is migrating

Answer explanation

The panda population in China is dwindling due to habitat loss and low birth rates. Conservation efforts are ongoing, but the challenges remain significant, leading to a decline in their numbers.

What term describes a species with a population of less than 2,500 individuals?

• Endangered species

• Common species

• Extinct species

• Vulnerable species

Answer explanation

A species with a population of less than 2,500 individuals is classified as an endangered species, indicating a high risk of extinction. Common species have larger populations, while extinct species no longer exist.

Why is biodiversity important?

• It decreases the number of species.

• It helps sustain most species and strengthens their ability to withstand environmental change.

• It only benefits plants.

• It has no impact on ecosystems.

Answer explanation

Biodiversity is crucial as it helps sustain most species, enhancing their resilience to environmental changes. This interconnectedness supports ecosystem stability and health, making the correct choice vital.

What is a food web?

• A single food chain

• A network of interconnected food chains

• A list of endangered species

• A type of ecosystem

Answer explanation

A food web is a complex network of interconnected food chains, illustrating how different organisms are related through feeding relationships. This distinguishes it from a single food chain, making the correct choice 'A network of interconnected food chains'.

What is the result of habitat destruction?

• Increased biodiversity

• Loss of species

• Improved air quality

• Creation of new habitats

Answer explanation

Habitat destruction leads to loss of species as their natural environments are altered or destroyed, making it difficult for them to survive. This results in decreased biodiversity, contrary to the incorrect options provided.

What happens to prey populations if a top predator is removed?

• They decrease.

• They remain stable.

• They increase.

• They become extinct.

Answer explanation

Removing a top predator allows prey populations to grow unchecked, leading to an increase in their numbers. Without predation, resources become more available, enabling prey to thrive.

When Mia introduced a non-native plant species into her garden, what was a likely consequence?

• Improved ecosystem health

• Balanced food webs

• Disruption of the food web

• Increased native species

Answer explanation

Introducing a non-native plant species can disrupt the food web by outcompeting native plants for resources, leading to a decline in native species and altering the balance of the ecosystem.

What is the impact of Burmese pythons on the Everglades ecosystem?

• They help control the rodent population

• They are a natural predator of cane toads

• They are considered an invasive species

• They improve water quality

Answer explanation

Burmese pythons are considered an invasive species in the Everglades, disrupting the ecosystem by preying on native wildlife and competing for resources, which negatively impacts biodiversity.