Unit 3 Test Quizizz

Energy flows through the trophic levels of a food web. Which of the following statements regarding this flow of energy is true?

• Energy is neither created nor destroyed; therefore, it is fully transferred to each trophic level. 
• Ecological pyramids diagram the flow of energy with producers at the top and consumers at the bottom.
• Energy flows down from the top consumers to other carnivores, then herbivores, and finally down to the producers
• Generally, only 10% of energy is transferred from one trophic level to the next.

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Food webs are used to depict the flow of energy through an ecosystem, as well as the relationships that exist between organisms in an ecosystem. These food webs do not, however, provide detailed information on the relative size of each population. Despite this fact, which generalization can be made about a functioning ecosystem?

• There will always be fewer primary consumers than secondary consumers.
• b. There will always be fewer decomposers than predators.
• c. There will always be more producers than consumers.
• d. There will always be more predators than consumers.

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Energy within an ecosystem flows from the producers to the consumers. However, a very important group of heterotrophs are decomposers. What role do decomposers serve in an ecosystem?

• They make their own food and provide energy for the rest of the system
• They break down organic matter into nutrients for other organisms.
• They change electromagnetic energy from the Sun into usable energy forms
• They consume the producers and provide energy for the higher consumers.

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A forest is shown in the picture below. How can producers be identified in this food web? 

• Producers are any organism below the top consumers.
• Producers always have arrows pointing toward them, but no arrows coming from them.
• Producers are the autotrophs that make their own food and have no arrows pointing toward them. 
• Producers are any organism on the food web, wince they all undergo metabolic reactions.

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Which of the following correctly describes the distribution of available energy among the different trophic levels of any food web?

• The amount of available energy is the highest among the primary and tertiary consumers of the food web.
• The amount of available energy decreases as the food web approaches the tertiary consumers.
• The amount of available energy is evenly distributed among the consumers in the food web.
• The amount of available energy increases as the food web moves from primary consumers to secondary and tertiary consumers.

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Which of the following best describes the flow of energy in a food web that contains the following organisms: fish, zooplankton, bacteria, and phytoplankton?

• fish --> zooplankton --> phytoplankton --> bacteria
• phytoplankton --> zooplankton --> fish --> bacteria
• phytoplankton --> zooplankton --> bacteria --> fish
• bacteria --> phytoplankton --> zooplankton --> fish

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Jamie has created this food web. Which of the following are at the same trophic level?

• Wolf and Insects
• Birds and Bees
• Deer and Red Fox
• Nuts and Leaves

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Which of the following correctly explains why the distribution of available energy decreases as the food web, shown below, moves from primary consumers to secondary and tertiary consumers?

• The lowest trophic levels receive their energy directly from the sun.
• Metabolism and other processes at each trophic level are not 100% efficient, losing lots of available energy as heat.
• Storage of available energy is easier for animals in the lower trophic levels than those at the top.
• The lower trophic levels have more biomass than the upper trophic levels.

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How can you identify herbivores in any food web? 

• Herbivores capture the energy from sunlight.
• Herbivores obtain energy by eating only plants.
• Herbivores are consumers that eat both plants and animals. 
• Herbivores break down organic matter.

Which of the following best explains the difference in the amount of available energy in the trophic levels of the desert ecosystem?

• There is less energy available in the producers because their tissues are less dense than those at higher trophic levels.
• There is more energy available in the second trophic level because less energy is needed for hunting compared to the higher trophic levels.
• There is more available energy in the birds of prey because they have greater muscle mass for storing energy than organisms in lower trophic levels have.
• There is less available energy in the fourth trophic level because of the loss of energy through metabolism in each of the lower trophic levels.

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