Question 1

Which group of organisms is primarily responsible for breaking down dead organic matter and returning nutrients to the soil in a matter cycle?

Accepted Answer

Decomposers

Answer

Producers

Answer

Apex predators

Answer

Primary consumers

Question 2

In the carbon cycle, which process removes carbon dioxide from the atmosphere to produce energy-rich food molecules?

Accepted Answer

Photosynthesis

Answer

Decomposition

Answer

Respiration

Answer

Combustion

Question 3

The Law of Conservation of Mass states that matter is neither created nor destroyed. How does this law relate to matter cycling in an ecosystem?

Accepted Answer

Matter is continuously recycled and transformed as it moves through the food web.

Answer

Matter is used up by consumers and must be replaced by sunlight.

Answer

Energy is converted into matter by decomposers to keep the cycle going.

Answer

Matter leaves the ecosystem as heat and does not return.

Question 4

Which of the following describes how water moves from the leaves of plants back into the atmosphere as part of the water cycle?

Accepted Answer

Transpiration

Answer

Precipitation

Answer

Infiltration

Answer

Condensation

Question 5

In the nitrogen cycle, how do most animals get the nitrogen they need to build proteins and DNA?

Accepted Answer

By eating plants or other animals

Answer

By absorbing nitrogen through their skin from the soil

Answer

By converting sunlight into nitrogen through photosynthesis

Answer

By breathing in nitrogen gas from the atmosphere

Question 6

Which of the following is an example of carbon moving from a biotic (living) part of the ecosystem to an abiotic (non-living) part of the ecosystem?

Accepted Answer

An animal breathing out carbon dioxide through cellular respiration

Answer

A wolf hunting and eating a rabbit

Answer

A plant absorbing sunlight during photosynthesis

Answer

A caterpillar eating a leaf to grow

Question 7

What happens to the atoms of a fallen log as it rots on the forest floor over many years?

Accepted Answer

The atoms are broken down by decomposers and recycled back into the soil and air.

Answer

The atoms remain trapped inside the dead wood forever and cannot be reused.

Answer

The atoms disappear and are permanently destroyed as the log vanishes.

Answer

The atoms are converted into pure energy to heat the forest floor.

Question 8

Which of the following describes the role of the ocean in the global carbon cycle?

Accepted Answer

It acts as a reservoir that absorbs and stores large amounts of dissolved carbon dioxide from the atmosphere.

Answer

It prevents matter from cycling by trapping carbon in salt crystals forever.

Answer

It is the primary source of nitrogen through the process of evaporation.

Answer

It creates new matter from sunlight to replace used carbon atoms.

Question 9

Which of the following describes the difference between how energy and matter move through an ecosystem?

Accepted Answer

Matter cycles repeatedly through the ecosystem, while energy flows in one direction and is eventually lost as heat.

Answer

Both energy and matter flow in one direction and must be constantly replaced by the moon.

Answer

Energy cycles repeatedly through the food web, while matter flows in one direction and disappears.

Answer

Both energy and matter cycle through the ecosystem and are never lost.

Question 10

Which human activity most directly impacts the carbon cycle by releasing large amounts of stored carbon back into the atmosphere in a short period of time?

Accepted Answer

Burning fossil fuels

Answer

Planting new forests

Answer

Overfishing in the oceans

Answer

Constructing hydroelectric dams

Question 11

What is the primary role of decomposers, such as bacteria and fungi, in the cycling of matter within an ecosystem?

Accepted Answer

They break down dead organic material and return essential nutrients to the soil.

Answer

They remove oxygen from the atmosphere to help plants breathe.

Answer

They are the primary source of energy for all carnivores in the food web.

Answer

They convert sunlight into chemical energy for plants to use.

Question 12

In the carbon cycle, which process is responsible for removing carbon dioxide (

CO_2

) from the atmosphere and converting it into stored glucose?

Accepted Answer

Photosynthesis

Answer

Combustion

Answer

Cellular respiration

Answer

Transpiration

Question 13

Which of the following describes how the Law of Conservation of Mass applies to matter cycling in an ecosystem?

Accepted Answer

The total amount of matter stays the same as it changes form and moves through the food web.

Answer

Matter is gradually destroyed as it is consumed by different animals.

Answer

New matter is created by producers when they grow from seeds.

Answer

Matter disappears from the ecosystem once an organism is decomposed.

Question 14

Which process in the water cycle involves water vapor cooling down and changing back into liquid water to form clouds?

Accepted Answer

Condensation

Answer

Runoff

Answer

Evaporation

Answer

Precipitation

Question 15

In the nitrogen cycle, how do most animals get the nitrogen they need to build proteins and DNA?

Accepted Answer

By eating plants or other animals that have already consumed nitrogen.

Answer

By converting sunlight into nitrogen molecules through a process called fixation.

Answer

By absorbing nitrogen through their skin while swimming in water.

Answer

By breathing in nitrogen gas (

CO_2

) directly from the atmosphere.

Question 16

Which of the following describes how carbon is moved from living organisms back into the atmosphere?

Accepted Answer

Cellular respiration

Answer

Nitrogen fixation

Answer

Photosynthesis

Answer

Deposition

Question 17

Which of the following describes the movement of matter compared to the flow of energy in an ecosystem?

Accepted Answer

Matter cycles through the ecosystem repeatedly, while energy flows in one direction and is eventually lost as heat.

Answer

Both matter and energy cycle through the ecosystem and are never lost.

Answer

Energy is created by decomposers, while matter is created by the sun.

Answer

Matter flows in one direction and disappears, while energy is recycled by decomposers.

Question 18

Which of the following describes the process of 'Transpiration' within the water cycle?

Accepted Answer

The release of water vapor into the atmosphere from the leaves of plants.

Answer

The process of liquid water turning into gas due to heat from the sun.

Answer

The process of water soaking into the ground to become groundwater.

Answer

The movement of water across the land surface into lakes and oceans.

Question 19

In the phosphorus cycle, how does phosphorus typically move from the soil into the biotic (living) parts of an ecosystem?

Accepted Answer

It is absorbed by plant roots from the soil in the form of phosphates.

Answer

It is created by bacteria converting atmospheric nitrogen into phosphorus.

Answer

It is inhaled by animals from the air during respiration.

Answer

It is absorbed by fish directly from sunlight in the ocean.

Question 20

Which of the following describes the role of 'Nitrogen Fixation' in the cycling of matter?

Accepted Answer

The process where bacteria convert atmospheric nitrogen gas into a form that plants can use.

Answer

The process where animals release nitrogen waste into the soil.

Answer

The process where plants release nitrogen gas back into the atmosphere through their leaves.

Answer

The process of nitrogen dissolving into raindrops during a storm.

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