Carbon Atom Story Quiz

Question 1

A carbon atom in carbon dioxide (CO₂) is absorbed by an oak tree during photosynthesis. What happens to that carbon atom inside the tree? (MS-LS2-3)

Accepted Answer

It is used to build sugar molecules that store energy in the tree's cells.

Question 2

A caterpillar eats a leaf from the oak tree, taking in the carbon atom. Which statement BEST describes what happens to most of that carbon in the caterpillar's body? (MS-LS2-3)

Accepted Answer

Most of the carbon is released as CO₂ during cellular respiration, while some builds the caterpillar's body.

Question 3

The caterpillar is eaten by a robin. The carbon atom is now in the robin's muscle tissue. What crosscutting concept BEST describes the fact that the carbon atom was never created or destroyed throughout this journey? (MS-LS2-3)

Accepted Answer

Energy and Matter: Conservation of Matter

Question 4

The robin dies and falls to the forest floor. Which organisms are MOST responsible for returning the carbon in the robin's body back to the soil and atmosphere? (MS-LS2-3)

Accepted Answer

Decomposers, such as fungi and bacteria

Question 5

A scientist removes all decomposers from a forest ecosystem in an experiment. Which outcome would MOST LIKELY occur over time? (MS-LS2-4)

Accepted Answer

Dead matter would pile up and nutrients would not be returned to the soil, causing producers to decline.

Question 6

Carbon moves from the atmosphere into living organisms and back again in a continuous loop. This movement of carbon through living and nonliving parts of an ecosystem is BEST described as — (MS-LS2-3)

Accepted Answer

the carbon cycle

Question 7

Which pair of processes works TOGETHER to cycle carbon between living organisms and the atmosphere? (MS-LS2-3)

Accepted Answer

Photosynthesis and cellular respiration

Question 8

Humans burn fossil fuels, releasing carbon that was stored underground for millions of years. How does this MOST directly affect the carbon cycle? (MS-LS2-5)

Accepted Answer

It adds extra carbon dioxide to the atmosphere faster than natural cycles can absorb it.

Question 9

A student claims: 'When a log rots in the forest, the matter in it disappears.' Which response BEST uses evidence to argue against this claim? (MS-LS2-4)

Accepted Answer

Decomposers break down the log and release its carbon as CO₂ and nutrients into the soil, where they are reused by plants — matter is conserved, not destroyed.

Question 10

Two communities are debating how to protect a local forest ecosystem. Community A wants to remove all dead trees and logs to 'keep the forest clean.' Community B wants to leave dead wood on the forest floor. Using your understanding of matter cycling, which community's plan BEST supports ecosystem health, and why? (MS-LS2-5)

Accepted Answer

Community B, because dead wood provides habitat for decomposers that recycle nutrients back into the soil, supporting the entire ecosystem.

Carbon Atom Story Quiz

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