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TLS Online TPP Program

#Question id: 4640

During drought years on the Galapagos, small, easily eaten seeds become rare, leaving mostly large, hard-cased seeds that only birds with large beaks can eat. If a drought persists for several years, what should one expect to result from natural selection?

#Unit 11. Evolution and Behavior

  1. Small birds gaining larger beaks by exercising their mouth parts.

  2. Small birds mutating their beak genes with the result that later-generation offspring have larger beaks.

  3. Small birds anticipating the long drought and eating more to gain weight and, consequently, growing larger beaks.

  4. More small-beaked birds dying than larger-beaked birds. The offspring produced in subsequent generations have a higher percentage of birds with large beaks.

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TLS Online TPP Program

#Question id: 12428

#Unit 10. Ecological Principles

Flycatcher birds that migrate from Africa to Europe feed their nestlings mostly with moth caterpillars. The data presented show the mean dates of egg laying, hatching, and fledging of flycatcher young, and the 1980 and 2000 peak mass of caterpillars.

Why are ecologists  concerned about the shift in  date from May 28 in  1980 to May 15 in  2000 of the caterpillar peak mass?
TLS Online TPP Program

#Question id: 12429

#Unit 10. Ecological Principles

Flycatcher birds that migrate from Africa to Europe feed their nestlings mostly with moth caterpillars. The data presented show the mean dates of egg laying, hatching, and fledging of flycatcher young, and the 1980 and 2000 peak mass of caterpillars.


Which of the following organisms is incorrectly paired with its trophic level? 
TLS Online TPP Program

#Question id: 12430

#Unit 10. Ecological Principles

Which of these ecosystems has the lowest net primary production per square meter?
TLS Online TPP Program

#Question id: 12431

#Unit 10. Ecological Principles

Nitrifying bacteria participate in the nitrogen cycle mainly by
TLS Online TPP Program

#Question id: 12432

#Unit 10. Ecological Principles

Which of the following has the greatest effect on the rate of chemical cycling in an ecosystem? 
TLS Online TPP Program

#Question id: 12433

#Unit 10. Ecological Principles

The Hubbard Brook watershed deforestation experiment yielded all of the following results except that