SCI 201 milestone 2

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Strayer University *

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201

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Biology

Date

Jan 9, 2024

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docx

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21 questions were answered correctly . 1 question was answered incorrectly . 1 Select the food chain that is in the correct order, starting at the first trophic level.  Flower, grasshopper, mouse, and toadstool  Toadstool, flower, grasshopper, and mouse  Flower, toadstool, grasshopper, and mouse  Toadstool, mouse, grasshopper, and flower RATIONALE The correct order, starting at the first trophic level, is a flower (primary producer), grasshopper (primary consumer), mouse (secondary consumer), and toadstool (decomposer). CONCEPT Food Chains and Food Webs Report an issue with this question 2 Choose the statement that correctly describes how carbon is cycled.  Through photosynthesis, carbon dioxide is changed into food with oxygen as a waste product.  Animals consume carbon and release oxygen, and plants consume oxygen and produce carbon.  By converting it into sugars, plants relay carbon to animals and animals convert it to oxygen.  Plants consume carbon and release oxygen, and animals consume oxygen and release carbon. RATIONALE In the carbon cycle, plants consume carbon dioxide as part of photosynthesis. Animals then eat plants and absorb the carbon, which

they then release into the atmosphere through their breath. The plants then absorb the carbon dioxide from the atmosphere, completing the cycle. Oxygen is a product of photosynthesis, but it is used by animals and humans, not wasted. Animals do not consume carbon and release oxygen, and plants do not consume oxygen and produce carbon; instead, it’s the other way around. Plants relay carbon to animals, but animals cannot convert carbon into oxygen. CONCEPT Photosynthesis and the Carbon Cycle Report an issue with this question 3 Which of the following is an example of predation?  A ladybug consumes aphids on a rose bush.  A clown fish lives safely within a sea anemone.  A plant develops large leaves to capture more sunlight.  A coral reef bleaches and dies. RATIONALE In predation, one species preys on or consumes another, including carnivores eating other species. In this case, a ladybug is preying on aphids. The clown fish and the sea anemone are in symbiosis. The plant is using evolutionary biology. The coral reef is likely experiencing global warming. CONCEPT Community Ecology Report an issue with this question 4 Which of the following is a strategy associated with restoration ecology?

 Creating a new wilderness area to limit human interactions with an endangered species  Studying an environment closely to determine ways to maintain biodiversity and a healthy ecosystem  Reintroducing native plant and animal species to a piece of land devastated by deforestation  Examining the biological structures of living and nonliving components in a given environment RATIONALE Reintroducing native species is associated with restoration ecology because it is a form of restoring damaged or destroyed ecosystems. The other strategies are associated with conservation biology. CONCEPT Conservation Biology and Restoration Ecology Report an issue with this question 5 Choose the example of a primary consumer in the food chain.  A squirrel that eats an acorn  An oak tree that drops acorns onto the ground  A snail that eats a decaying acorn on the forest floor  An eagle that eats a squirrel RATIONALE The squirrel is a primary consumer because it is an herbivore and consumes the acorn. The oak tree is a producer. The eagle is a secondary consumer. The snail is a decomposer. CONCEPT

Food Chains and Food Webs Ecosystem Ecology Report an issue with this question 6 Environmental scientists cite several challenges to protecting endangered species. Which of the following is NOT a difficulty faced by those working to protect endangered species?  Identifying danger for a species may come too late to reverse the danger.  People aren’t that interested in protecting animals they do not consider valuable.  There is no legislation in the United States to protect species identified as endangered.  It is difficult to enforce protection policies in some environments. RATIONALE Endangered species in the United States are protected under the Endangered Species Act of 1973. Protecting endangered species can be slowed by a lack of enforcement, lack of interest, or failure to identify the threat soon enough. CONCEPT Endangered Species Report an issue with this question 7 Select the statement that refers to an exponential population growth model.  The slope of the graph in this model is steepest near the top.  This model considers carrying capacity when examining population growth.

 This graph is a more realistic model of population growth.  This model considers a limited amount of natural resources when examining population growth. RATIONALE In an exponential growth model, the line is shaped like a J, with a shallower growth curve near the bottom and a steeper growth curve at the top. This model does not consider resource availability or carrying capacity, making it less realistic than a logistic model. CONCEPT Population Ecology Report an issue with this question 8 Which list correctly orders the examples of an organism, population, community, and ecosystem?  Parrot, a flock of parrots, animals in the rainforest, and the rainforest  Fungi, trees, forest, and a stream running through the forest  Algae, insects, fish, and pond  Honeybee, a hive of bees, a meadow of flowers, and a river RATIONALE The correct example is a parrot (an organism), a flock of parrots (a population), animals in the rainforest (a community), and the rainforest (an ecosystem). The other examples are not in the correct order or contain more than one example from the same organizational level. CONCEPT Ecology Report an issue with this question 9

Which statement is characteristic of an invasive species?  A species that has been domesticated  A species that can reproduce rapidly  A species that remains in its original environment  A species that has natural predators and competitors RATIONALE Invasive species have few natural predators, competitors, or other limiting factors in their new environment, resulting in high birth rates and a rapidly growing wild population. CONCEPT Native and Non-Native Species Report an issue with this question 10

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