Look at the photo of a small green sprout emerging from dark soil. Is the object highlighted in the image biotic or abiotic?

Look at the photo of a rocky shoreline at sunset with water and sky visible. Is the scene primarily showing biotic or abiotic factors?

Look at the photo of yellow-green lichen growing on a tree branch. Is the organism shown biotic or abiotic?

Which term matches this definition: a specific ecological area that is inhabited by a particular plant or animal species?

Which term matches this definition: the role that a species plays in its community?

What are some factors that affect ecosystems? Select all that apply.

Which statement best describes a keystone species?

What is a likely result of removing a keystone species from an ecosystem?

Which statement describes primary succession?

During primary succession, which organisms are among the first colonizers?

Which statement describes secondary succession?

In secondary succession, what does the community rebuild on?

What is the ultimate source of energy for most ecosystems?

Energy flow in ecosystems can be visualized in which ways? Select all that apply.

In a food web diagram, what do the arrows represent?

Which level of a healthy ecosystem contains the most available energy?

What happens to most energy as it moves from one trophic level to the next?

As we move up the trophic pyramid, which of the following decreases? Select all that apply.

What does biomass refer to in an ecosystem?

Suppose $$3{,}000$$ kCal of energy is available at the primary consumer level. How much energy would be available to the tertiary consumer?

An owl at the tertiary consumer level obtains $$23$$ J of energy from an organism that it consumed. How much energy was available initially to the owl?

Producers (autotrophs) use which inputs to make organic compounds?

Why is the stability of producers vital to ecosystems?

How does energy flow through an ecosystem? Which organisms use energy from sunlight to make food by photosynthesis?

How does energy flow through an ecosystem? Which group of autotrophs uses energy from chemical compounds to make food and includes some bacteria and archaea?

How does energy flow through an ecosystem? According to the notes on producers (autotrophs), how many basic types of autotrophs are described?

How does energy flow through an ecosystem? Consumers (heterotrophs) are described as organisms that depend on what for food?

How does energy flow through an ecosystem? Which organisms are listed as consumers (heterotrophs) in the notes?

How does energy flow through an ecosystem? In the classification of consumers by what they eat, which group consumes animals such as those listed (lions, polar bears, hawks, frogs, salmon, and spiders)?

How does energy flow through an ecosystem? Which consumers are a necessary link between producers and other consumers because they consume producers such as plants or algae?

How does energy flow through an ecosystem? What do decomposers release back to the environment when they break down remains and other wastes?

How does energy flow through an ecosystem? What is the stated take-away about decomposers?

How does energy flow through an ecosystem? Which decomposer group consumes the soft tissues of dead animals (examples: vultures, raccoons, blowflies)?

How does energy flow through an ecosystem? Detritivores primarily consume what, according to the notes (dead leaves, animal feces, and other organic debris)?

How does energy flow through an ecosystem? Which decomposers are described as the final step in decomposition, feeding on any remaining organic matter left after other decomposers do their work?

How does energy flow through an ecosystem? According to the note, which organisms are the only ones that can decompose wood?

How does matter move through an ecosystem? What do the biogeochemical cycles provide, according to the notes?

How does matter move through an ecosystem? Unlike energy, what CAN be recycled?

Based on the Carbon Cycle diagram showing processes such as industrial emissions, respiration, photosynthesis, diffusion, decomposition, and fossil fuels, which processes put carbon into the atmosphere? Select all that apply.

Based on the Carbon Cycle diagram showing processes such as industrial emissions, respiration, photosynthesis, diffusion, decomposition, and fossil fuels, which processes remove carbon from the atmosphere? Select all that apply.

Refer to the labeled diagram of the water cycle showing evaporation, condensation, precipitation, transpiration, infiltration, percolation, runoff, and groundwater. Which process moves liquid water from the surface into the soil?

In the water cycle, which labeled process is the release of water vapor from plants into the atmosphere?

Based on the water cycle diagram, which change of state is occurring when water vapor becomes liquid droplets in clouds?

Population ecology is the study of how populations of plants, animals, and other organisms change over time and space and interact with their environment. Which term is defined as the number of individuals in the population?

Population ecology describes characteristics that include population size, population density, and population growth. What does population density specifically measure?

Some species have adaptations that minimize competition within a population. The worksheet example compares tadpoles and adult frogs. What is the ecological purpose of these stage differences?

According to the worksheet, an increase in one population can cause what effect in another population within the same ecosystem?

A change in population size is known as which term?

According to the worksheet, a growth rate can take which forms? Select all that apply.

If a population is provided with ideal conditions, it will increase in number, and healthy organisms reproduce at a rate greater than their death rate. What is this pattern of increase called?

The graph titled Exponential Growth shows bacteria increasing slowly at first and then rising rapidly over time. What feature of the curve indicates exponential growth?

Growth rates have limits because, as populations increase, resources are depleted. What term describes the maximum number of individuals an environment can support given the resources available?

According to the worksheet, what can happen if populations exceed their carrying capacity?

Limiting factors determine the carrying capacity of a population. Which of the following are listed as limiting factors for population growth? Select all that apply.

How do human activities impact ecosystems? Environmental change impacts the stability of an ecosystem. Based on the images of a polluted water body near industrial facilities and a forest fire in a woodland, which option best describes how these examples relate to ecosystem stability?

How do human activities impact ecosystems? Organisms are limited in their ability to survive within a changing environment. Which environmental changes can limit survival?

How do human activities impact ecosystems? Human activities that impact the stability of an ecosystem include which of the following?

How do organisms interact within an ecosystem? Symbiosis is the ecological relationship between two species. Which type of symbiosis is described as one organism benefiting at the expense of the other?

How do organisms interact within an ecosystem? Symbiosis is the ecological relationship between two species. Which type is described as one benefits and the other neither benefits nor is harmed?

How do organisms interact within an ecosystem? Symbiosis is the ecological relationship between two species. Which type is described as both benefit?

How do organisms interact within an ecosystem? Symbiosis is the ecological relationship between two species. Which type is described as one eats the other?