Review 05/23

Which of the following is currently a primary cause of species extinction worldwide?

• Habitat destruction
• Intraspecific competition
• Random mating
• Viral outbreaks

Ecosystems will have a greater chance of maintaining balance over a long period of time if they have

• organisms imported by humans from other environments
• a diversity of organisms
• a sudden change in climate
• predators eliminated from the food chain

A greater stability of the biosphere would most likely result from

• decreased finite resources
• increased deforestation
• decreased consumer populations
• increased biodiversity

Which condition would most likely upset the stability of an ecosystem?

• Energy constantly entering the environment
• A cycling of elements between organisms and the environment
• A greater amount of animals than plants
• Green plants going through photosynthesis

Cutting down a Rain Forest and planting agricultural crops, such as coffee plants, would most likely result in

• a decrease in biodiversity
• an increase in the amount of energy recycled
• an increase in the amount of photosynthesis
• a decrease in erosion

Humans have changed ecosystems in many ways.  The most positive impact on an ecosystem would result from

• planting many different plants that are native to the area in a vacant lot
• planting a single economically valuable crop in a 25-acre area
• seeding an area with valuable plants that are from another ecosystem
• filling in a swamp and planting grass and trees for a community park

The goals of biodiversity conservation include all of the following EXCEPT

• protecting individual species
• introducing exotic species into new environments
• preserving habitats and ecosystems
• making sure local people benefit from conservation efforts

Which represents an indirect economic value of biodiversity?

• Food
• Clothing
• Flood protection
• Medicines

In some parts of the world, Rain Forests are being cut down to build homes and farms.  How does the loss of these trees impact the atmosphere?

• It causes oxygen to be added to the atmosphere
• It decreases the amount of carbon removed from the atmosphere
• It increases the amount of carbon removed from the atmosphere
• It decreases the amount of fossil fuels produced.

A species that may become extinct in the near future is known as a(an) _________ species

• Keystone
• Endangered
• Exotic
• Threatened