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Component 1: Physical Geography
1. Water and Carbon Cycles
1.2. The Carbon Cycle
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The carbon cycle involves
natural
and
human-influenced
processes
The carbon cycle includes exchanges between the atmosphere, land,
oceans
, and living organisms.
True
Decomposition releases CO₂ back into the atmosphere and soil.
True
Order the key processes within the carbon cycle:
1️⃣ Photosynthesis
2️⃣ Respiration
3️⃣ Decomposition
4️⃣ Combustion
What is the carbon cycle?
Exchange of carbon atoms
Match the process with its description:
Photosynthesis ↔️ Plants absorb CO₂ and convert it into glucose
Respiration ↔️ Plants and animals release CO₂
Decomposition ↔️ Decomposers break down organic matter
Combustion ↔️ Burning fossil fuels releases CO₂
Combustion releases CO₂ into the
atmosphere
Human activities have disrupted the equilibrium of the carbon cycle.
True
Burning fossil fuels releases large amounts of CO₂ into the
atmosphere
What are the three main reservoirs involved in the carbon cycle?
Atmosphere, land, oceans
Arrange the following carbon cycle processes in a logical sequence of carbon transfer:
1️⃣ Photosynthesis
2️⃣ Respiration
3️⃣ Decomposition
4️⃣ Combustion
5️⃣ Ocean Exchange
Oceans act as natural carbon sinks by absorbing CO₂ through dissolution and biological
processes
Artificial carbon sinks, such as underground storage, require suitable geological
formations
Ocean exchange is a process where CO₂ dissolves from the atmosphere into the
oceans
and vice versa.
True
What is released from volcanoes through eruptions?
CO₂
What is the main source of carbon absorbed by plants during photosynthesis?
Atmospheric CO₂
What human activities have disrupted the carbon cycle's equilibrium?
Fossil fuel combustion and deforestation
Match the carbon sink with its benefit:
Oceans ↔️ Reduces atmospheric CO₂ and buffers acidity.
Forests ↔️ Stores carbon in biomass and supports biodiversity.
Soils ↔️ Enhances fertility and reduces CO₂.
Carbon sinks help to mitigate the effects of
climate change
Steps to address disruptions in the carbon cycle:
1️⃣ Reduce fossil fuel combustion
2️⃣ Increase reforestation efforts
3️⃣ Develop carbon capture technologies
4️⃣ Promote sustainable land use practices
What happens to the ocean's ability to absorb CO₂ when it becomes acidified?
Decreases
What releases CO₂ back into the atmosphere as organic matter is broken down?
Decomposition
The carbon cycle involves processes that transfer carbon between the atmosphere, land, and
oceans
Which process releases CO₂ back into the atmosphere as plants and animals break down glucose for energy?
Respiration
What is the primary role of carbon sinks in the carbon cycle?
Absorb and store CO₂
Match the natural carbon sink with its key reservoir:
Oceans ↔️ Absorb CO₂
Forests ↔️ Store carbon in biomass
Soils ↔️ Store carbon from organic matter
Cement production releases CO₂ from limestone, contributing to
atmospheric
CO₂ levels.
True
What molecule is absorbed by plants during photosynthesis?
CO₂
Burning fossil fuels for energy is an anthropogenic source of
CO₂
Cement production releases CO₂ from heating
limestone
Match the carbon cycle process with its description:
Photosynthesis ↔️ Plants absorb CO₂ and store carbon.
Respiration ↔️ Plants and animals release CO₂.
Decomposition ↔️ Decomposers break down organic matter.
Combustion ↔️ Burning fossil fuels releases CO₂.
What are three natural carbon sinks mentioned in the study material?
Oceans, forests, and soils
Deforestation reduces the ability of forests to store
carbon
.
True
What is the main human-induced disruption to the carbon cycle?
Imbalance in carbon exchange
Increased atmospheric CO₂ enhances the greenhouse effect and global warming.
True
What do plants and animals release during respiration?
CO₂
Which reservoirs are involved in ocean exchange within the carbon cycle?
Atmosphere and Oceans
Plants absorb CO₂ from the atmosphere during
photosynthesis
What do plants store carbon in during photosynthesis?
Biomass
In photosynthesis, plants absorb CO₂ from the atmosphere and convert it into
glucose
See all 50 cards
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