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TLS Online TPP Program

#Question id: 12570

Extinction is a natural phenomenon. It is estimated that 99% of all species that ever lived are now extinct. Why then do we say that we are now in a biodiversity crisis?

#Unit 10. Ecological Principles
  1. Humans are ethically responsible for protecting endangered species.
  2. Scientists have finally identified most of the species on earth and are thus able to Quantify the number of species becoming extinct.
  3. The current rate of extinction is high and human activities threaten biodiversity at all levels.
  4. Humans  have  greater  medical  needs  than  at  any  other  time  in  history,  and  many  potential  medicinal compounds are being lost as plant species become extinct.
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TLS Online TPP Program

#Question id: 13178

#Unit 10. Ecological Principles

Turnover of water in temperate lakes during the spring and fall is made possible by which of the following? 
TLS Online TPP Program

#Question id: 13179

#Unit 10. Ecological Principles

In temperate lakes, the surface water is replenished with nutrients during turnovers that occur in the
TLS Online TPP Program

#Question id: 13180

#Unit 10. Ecological Principles

Which of the following is responsible for the summer and winter stratification of deep temperate lakes?
TLS Online TPP Program

#Question id: 13181

#Unit 10. Ecological Principles

Generally speaking, deserts are located in places where air masses are usually
TLS Online TPP Program

#Question id: 13182

#Unit 10. Ecological Principles

The MacArthur-Wilson equilibrium model of island biogeography predicts the number of species found on islands. The figure below depicts two volcanic islands located off a section of mainland coast.

The MacArthur-Wilson model predicts that the relative numbers of bird species on the mainland and two islands would be
TLS Online TPP Program

#Question id: 13183

#Unit 10. Ecological Principles

The MacArthur-Wilson equilibrium model of island biogeography predicts the number of species found on islands. The figure below depicts two volcanic islands located off a section of mainland coast.


According to the MacArthur-Wilson model, how would the number of bird species change from the time of an island's formation (assuming it remains constant in size and isolation)?