Ecology 2025 (Ck12) Lesson 1

Multiple Choice

Which of the following is NOT considered an abiotic factor in an ecosystem?

• Temperature

• Water

• Light

• Animals

Multiple Select

Which of the following are considered abiotic factors in an ecosystem? Choose all that apply.

• Water

• Animals

• Soil

• Sunlight

Multiple Choice

Which of the following is an example of a biotic factor in an ecosystem? Choose all that apply.

• Sunlight

• Soil

• Fungi

• Temperature

Match

Match the Terms.

• Living things in an ecosystes

• Non-living things in an ecosystem

• All the organisms of the same species that live in the same area.

• Another term for an autotroph

• All the living things in together with the nonliving environment.

Biotic factors

Abiotic factors

Population

Producers

Ecosystem

• Biotic factors

• Abiotic factors

• Population

• Producers

• Ecosystem

Fill in the Blank

The process by which nutrients such as carbon and nitrogen are recycled through the biotic and abiotic components of an ecosystem is known as a ___ cycle.

Multiple Choice

In an energy pyramid, what percentage of the original energy from plants is typically available to carnivores?

• 100%

• 10%

• 1%

• 0.1%

Fill in the Blank

Approximately ___% of the energy at one trophic level is stored at the next level.

Multiple Choice

Which trophic level contains the most energy in an energy pyramid?

• Producer

• Primary consumer

• Secondary consumer

• Tertiary consumer

Multiple Choice

What is the main role of decomposers in an ecosystem?

• Break down dead organic matter and return nutrients to the ecosystem

• Produce energy through photosynthesis

• Consume only herbivores

• Transfer energy directly to producers

Multiple Select

Which of the following statements about consumers in a food web are correct? Choose all that apply.

• They obtain energy by eating other organisms.

• They can be herbivores or carnivores.

• They produce their own food through photosynthesis.

• They are found at multiple trophic levels.

Fill in the Blank

A diagram that represents multiple intersecting food chains through which energy and matter flow is called a ___ web.

Multiple Choice

Which of the following is a major contributing factor to global warming?

• Excess carbon dioxide in the atmosphere

• Decreased use of fossil fuels

• Increased plant growth

• Reduction in greenhouse gases

Multiple Select

Which of the following are major sources of excess carbon dioxide emissions according to the data presented? Choose all that apply.

• Transportation

• Electricity generation

• Agriculture

• Industry

Multiple Choice

What is the main reason burning fossil fuels leads to an increase in atmospheric carbon dioxide?

• It releases carbon that was previously locked away underground

• It increases photosynthesis rates

• It decreases decomposition

• It forms new fossil fuels

Fill in the Blank

The primary greenhouse gas responsible for about three-quarters of emissions is ___.

Multiple Choice

Which of the following is NOT an example of an essential nonliving thing in an ecosystem?

• Air

• Water

• Sunlight

• Plants

Open Ended

How do nonliving things contribute to the survival of living organisms in an ecosystem?