Front

Which action will most likely cause a negative impact on the biodiversity of a small region? Options: planting native species in a bare field to attract wildlife, draining a wetland for the development of a new park, reducing the amount of pesticides and fertilizers used, having a controlled burn to remove undergrowth of a forest

Back

draining a wetland for the development of a new park

Front

How could a global decrease in plant diversity affect the biosphere?

Back

It could cause a decrease in animal populations in the biosphere.

Front

What is likely to cause the greatest change in the vegetation of the African savanna?

Back

A decrease in the elephant population.

Front

How does a leafcutter ant colony help to support the tropical rain forest biome?

Back

The colony recycles nutrients back to the soil for plants to use.

Front

What do the different bloom times reveal about this wood anemone population?

Back

There is genetic variation among individuals in the population.

Front

Which of the following is an activity that does NOT take place in the biosphere?

• aerobic bacteria breaking down dead plant material
• ocean waves wearing down a rocky shoreline
• West Nile virus being carried by mosquitoes

Back

ocean waves wearing down a rocky shoreline

Front

Which of the following is likely to have the MOST biodiversity? Options: a tropical forest, an arctic tundra, a deciduous forest, a residential backyard.

Back

a tropical forest

Front

Why is it difficult to create a terrarium ecosystem that will last a long time without human help?

Back

Ecosystems with few species are weak and unstable.

Front

Which of these is a threat to the survival of an ecosystem?

• predator-prey population cycles
• less biomass at higher levels of the food web
• a shrinking variety of animal and plant species
• competition among some consumer populations

Back

a shrinking variety of animal and plant species

Front

Why is it important to conserve the biodiversity of Earth?

Back

To increase the stability of ecosystems during environmental changes.