Biodiversity Env. Ch. 10

 A species in danger of extinction is called:

• Threatened
• Endangered
• Extinct
• Exotic

How many species are estimated to be living on Earth?

• 1-2 million
• 10-50 million
• 5-10 million
• 50-100 million

Which of the following would be most effective in slowing the loss of biodiversity?

• every country must maintain a seed bank
• setting aside small plots of land
• creating parks or preserves
• freezing fertilized eggs

In what part of the world are the greatest number of extinctions occurring?

• mountains
• pine forests
• great plains
• tropical rainforests

Which country has the strongest laws to protect endangered species?

• US
• Germany
• England
• China

what percentage of species have become or are expected to become extinct between 1900 and 2100?

• 1%
• 10%
• 25%
• 75%

The fact that organisms are adapted to survive in particular environments helps to explain why

• compromise is impossible on environmental issues.
• captive-breeding programs are often ineffective
• habitat destruction accounts for most extinctions.
• non-native plant species never flourish in new areas

The number and variety of species on Earth is called ____________________.

• biodiversity
• keystone
• exotic
• none of these

The  level of biodiversity that involves a variety of habits and communities is

• population diversity
• genetic diversity
• species diversity
• ecosystem diversity

Biodiversity important to ecosystems because

• It increases at each level of the food chain.
• It helps populations adapt to ecological changes
• It allows animals to feed permanently from one type of plant
• It reduces the number of insects in a given ecosystem