high importancemedium8 min

Carbon Cycle

The carbon cycle is the movement of carbon among the atmosphere, living organisms, oceans, soil, rocks, and fossil fuels through processes such as photosynthesis, respiration, decomposition, and combustion.

Practice This Concept

Main explanation

Teacher explanation

Plants take carbon dioxide from air during photosynthesis and make food. Animals get carbon by eating plants or other animals. Respiration and decomposition return carbon dioxide to the atmosphere. Burning fuels also releases carbon dioxide, so human activity can increase atmospheric carbon.

Example

A tree absorbs carbon dioxide during photosynthesis, a deer eats leaves, and both plants and animals release carbon dioxide during respiration.

Simple analogy

Plants take carbon in; breathing, decay, and burning send it back.

Common confusion

Students often mention photosynthesis but forget respiration, decomposition, and combustion as pathways returning carbon to the atmosphere.

Exam tip

For carbon-cycle answers, write reservoirs and processes: atmosphere, plants, animals, soil, oceans, photosynthesis, respiration, decomposition, and combustion.

Study the carbon cycle diagram carefully

Use the labelled diagram to keep carbon cycle clear in short answers and revision.

What this diagram makes clear

This diagram keeps the labels and direction of carbon cycle in the right order.

Where this helps in exams

Use this for labelled diagram work and short exam answers on carbon cycle.

Revision cue

Revise carbon cycle through the labels before writing the answer.

Answer writing and exam use

1-mark use

Write the exact meaning of carbon cycle in one clean line.

2-mark use

Define carbon cycle and add one example or condition.

3-mark use

Explain carbon cycle, show the method or example, and mention the common mistake.

MCQ Quiz

Practice this concept with focused MCQs

Open the concept quiz intro first, review the test details, and then start a focused MCQ set from this concept only. Instant score and answer review are live now.

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