Bio 1.3 - Pre-Assessment

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• 5

Which choice best describes why 90% of all marine organisms thrive/live in the photic zone, which is the portion of a body of water that receives light from the sun and interacts with the atmosphere?

• The photic zone is a major source of carbon and nitrogen as nutrients for many organisms.
• Salinity and pH levels within the photic zone are most stable, enabling more organisms to live there.
• The photic zone is where photosynthesis occurs, and animals need photosynthetic organisms for food.
• All organisms need sunlight to live and they stay in the photic zone in order to gain the most sunlight possible.

When taken to a new habitat, non-native plants often threaten native plants of the new habitat. Why do non-native plants threaten native plants?

• Non-native plants are able to mutate rapidly.
• Non-native plants cause native plants to relocate.
• Non-native plants are able to be used for medicine.
• Non-native plants compete with native plants for resources.

Which type of succession is likely to occur immediately following a volcanic eruption that caused total destruction of a given area?

• Secondary succession because all of the soil was lost in the eruption.
• Primary succession because new organisms will be needed to create soil.
• Secondary succession because some previous soil will still be left behind after the eruption.
• Primary succession because it killed many of the organisms in the mountainous ecosystem.

A population of rodents becomes stranded on a remote island. Eventually, the population reaches the island’s carrying capacity. At this point, which statement would be true about the birth and death rates in this population?

• Birth and death rates would be relatively equal.
• Birth and death rates would be crashing.
• Birth and death rates would be density independent.
• Birth and death rates would be increasing exponentially.

The population of adult frogs in a wetlands ecosystem has increased to 1000 individuals, which is its carrying capacity. The frogs eat flies and other small animals, and they are prey for raccoons, snakes, and a variety of large birds. Which most likely would happen if an additional 200 adult frogs immigrated to the ecosystem?

• The carrying capacity for frogs in the ecosystem would increase by 200 frogs.
• The population frogs would decrease because of limited resources, or by predation or disease.
• The carrying capacity for frog predators in the ecosystem would increase by 200 individuals.
• The frog population would decrease by 200 frogs because of the individuals leaving the population.

There are 39 native species to the Florida Everglades National Park that are listed as threatened or endangered. Climate change has caused an increase in catastrophic events, such a hurricanes. What impact would a catastrophic event have on the endangered species ecosystem?

• An event could cause a loss of an endangered species, which would increase the mutation rate in plants.
• An event could cause a loss of an endangered species, which would ​​​​​​​reduce biodiversity in the ecosystem.
• An event could cause a loss of an endangered species, which would cause pesticides to become more toxic to insects.
• An event could cause a loss of an endangered species, which would decrease the space and resources available to other organisms.

What type of species would be most likely found in the area labeled 3 in the figure below?

• Plants that require sunlight.
• Animals that require plenty of oxygen.
• Amphibians that need a warm habitat.
• Species that feed on dead organisms.