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- 1. Multiple ChoiceDDT is a pesticide that was once widely used to control agricultural pests and mosquitoes. However, this pesticide caused the eggshells of certain birds, including the brown pelican, to become fragile and thin. The adults would then accidentally crush the eggs while trying to incubate them. What happened to brown pelican populations as a result of DDT use by humans?The populations increased much more slowly.The populations decreased as fewer eggs survived long enough to hatch.The populations remained stable over time.The populations increased as pelicans laid more eggs so that more offspring would survive.
- 2. Multiple ChoiceWhich of the following is most likely to cause a change in the genetic traits in an isolated population of a ground-dwelling lizard species?The exposure of an individual lizard in the population to radiation that causes a mutation that is not passed on to its offspring.An unusually dry summer in the lizard population’s ecosystem.The introduction of an invasive predator that preys on the brightest-colored individuals in the lizard population.A fast-moving wildfire that burns the canopy of the trees in the lizard population’s ecosystem.
- 3. Multiple Choice
The white-tailed ptarmigan lives at high elevations on mountains that receive a lot of snow in the winter. During the summer, the ptarmigans’ feathers are mottled brown. The birds lose the brown feathers and grow a new set of white feathers during the winter. Scientists are concerned that rising global temperatures will affect the white-tailed ptarmigan. If global climate change leads to the elimination of snow in the habitat of white-tailed ptarmigans, which adaptation is most likely to occur over many generations?Birds with white feathers in areas without winter snow will be easier for predators to find. Over time this could lead to white-tailed ptarmigans that have brown feathers throughout the year.Birds with brown feathers in areas without winter snow will be easier for predators to find. Over time this could lead to white-tailed ptarmigans that have white feathers throughout the year.Birds with white feathers will be easier to see on the ground in the summer. Over time this could lead to white-tailed ptarmigans that have white feathers throughout the year.Birds with brown feathers will be easier to see on the ground in the winter. Over time this could lead to white-tailed ptarmigans that have brown feathers throughout the year. - 4. Multiple ChoiceThe organism in the photo is a daphnia, or water flea. Daphnia are tiny aquatic organisms that live in most freshwater habitats. Adults range from less than 1 to 5 mm in length. They are good swimmers and eat mostly algae. Daphnia become mature at 5 to 10 days, and an adult female can produce up to 100 eggs every 3 or 4 days during its 2-month life span. When harmful algae rapidly increase in the daphnia’s environment, daphnia can develop adaptations to tolerate the negative effects of the algae within 10 years. What characteristic of the daphnia allows the population to adapt to environmental change?Its small size.Its short generation time.Its freshwater environment.Its herbivorous diet.
- 5. Multiple ChoiceThe Guam rail is a flightless bird found on the island of Guam. It builds a shallow nest on the ground and lays eggs throughout the year. There are no native species of snakes on Guam,so the Guam rail had no experience with snake predators until the brown tree snake was accidentally introduced sometime between 1944 and 1952. These snakes, which eat a wide variety of animal species, quickly established a large population on Guam. How was the Guam rail most likely affected by the introduction of the brown tree snake?The brown tree snake ate only species that lived in trees, so it had no effect on the Guam rail.The Guam rail quickly developed the ability to fly in order to escape from the brown tree snake.The population of the Guam rail declined, and the species nearly became extinct.The Guam rail began to build its nests in trees.
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