Disruption of Ecosystems

What is biodiversity?

Answer explanation

Biodiversity refers to the variety of life on Earth, including the different species, ecosystems, and genetic diversity within species. It is crucial for ecosystem health and resilience.

What are alien species?

Answer explanation

Alien species are organisms that are introduced to a new environment outside their native range, often leading to ecological impacts. They can disrupt local ecosystems and outcompete native species.

Fill in the blank: Overpopulation isn't just caused by alien species. Native populations can get too big when nothing keeps them in ______.

• check

• balance

• control

• order

Answer explanation

The correct choice is 'check' because it refers to mechanisms that limit population growth. When native populations have no factors to keep them in check, they can grow excessively, leading to overpopulation.

The impact of climate change on ecosystems is:

• Beneficial for all species

• Harmful to many species

• No effect on ecosystems

• Only affects marine life

Answer explanation

Climate change disrupts habitats, alters food availability, and increases stress on many species, making it harmful to biodiversity. Thus, the correct answer is that it is harmful to many species.

Why does it matter if a few species become extinct or are extirpated from an ecosystem?

• It doesn't matter at all.

• It can lead to a loss of biodiversity.

• It improves the ecosystem's health.

• It has no impact on humans.

Answer explanation

The extinction or extirpation of species can significantly impact ecosystems, leading to a loss of biodiversity. Biodiversity is crucial for ecosystem stability, resilience, and the services they provide to humans and the environment.

What is a potential consequence of introducing non-native species into an ecosystem?

• Increased biodiversity

• Disruption of local species

• No impact on the ecosystem

• Improved ecosystem health

Answer explanation

Introducing non-native species can disrupt local species by outcompeting them for resources, leading to declines or extinctions. This negatively impacts the ecosystem's balance and overall health.

Which of the following is a method to control overpopulation in wildlife?

• Pollution increase

• Climate change

• Introduction of predators

• Habitat destruction

Answer explanation

The introduction of predators is a method to control overpopulation in wildlife by naturally regulating prey populations, thus maintaining ecological balance. Other options like pollution and habitat destruction are harmful.

How does deforestation affect ecosystems?

• Has no effect

• Improves soil quality

• Increases oxygen levels

• Reduces biodiversity

Answer explanation

Deforestation leads to habitat loss, which significantly reduces biodiversity. Many species depend on forests for food and shelter, and their extinction can disrupt entire ecosystems.