Y12 - End of Term (Autumn)

Which factor that limits a population's size is important only when populations become large and dense?

• seasonal cycles

• sea level height

• extreme weather

• predator-prey relationships

What is the carrying capacity for this sheep population?

• 0.7 million

• 2 million

• 1.6 million

• 1 million

If a population grows larger than the carrying capacity of the environment, the

• death rate may rise
• birth rate may rise
• death rate must fall
• birth rate must fall

Disease is an example of

• density dependent limiting factors

• density independent limiting factors

The LESS genetically diverse a population is, the better it can respond to environmental stressors

• True

• False

Species that are clearly critical to the functioning of an ecosystem are known as

• biodiversity

• keystone species

• main species

• native species

A species that is likely to become extinct if protective measures are not taken immediately is known as

• threatened species

• endemic species

• keystone species

• endangered species

The lionfish is a venomous fish found primarily in the Red Sea and the Indian Ocean. In the 1990s, lionfish were accidentally released into the Atlantic Ocean, where they found abundant resources and favorable environmental conditions. Which of the following scenarios is most likely to result in the lionfish having a major impact on the communities into which they were introduced?

• With no natural predators, the lionfish population will become very large.

• Some native species of invertebrates will develop a resistance to lionfish venom.

What species was removed from the Channel Islands so the Island Fox could thrive?

• Golden Eagle

• Bald Eagle

• Deer Mouse

• Scrub Jay

What is the environmental resistance or limiting factor if a person is infected with a virus?

• Lack of food

• Loss of habitat

• Disease/Epidemic

• Competition