Why is "Calling Antarctica a 'frozen continent' rather than a desert" a common mistake in The Antarctic Ecosystem Part 1?

Why it happens: Most deserts feel hot. How to avoid it: DESERT is defined by RAINFALL (<250 mm/year), not temperature. Antarctica receives <50 mm/year in most areas — a polar desert. Source: 0460 Examiner Reports 2022-2024

Why is "Listing food chain without identifying keystone" a common mistake in The Antarctic Ecosystem Part 1?

Why it happens: Default sequence focus. How to avoid it: Krill are the KEYSTONE — the whole ecosystem depends on them. Their loss would cascade.

Changing EcosystemsCambridge IGCSE Geography (0460)

The Antarctic Ecosystem Part 1

Q: Why is "Listing food chain without identifying keystone" a common mistake in The Antarctic Ecosystem Part 1?

Why it happens: Default sequence focus. How to avoid it: Krill are the KEYSTONE — the whole ecosystem depends on them. Their loss would cascade.

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Antarctic Ecosystem Part 1 Study Notes — Cambridge IGCSE Geography 0460 (2024-2026 syllabus)

Antarctica's polar-desert climate. The marine food chain centred on phytoplankton and krill. Animal adaptations to extreme cold.

What you’ll learn

Mapped to the Cambridge IGCSE 0460 syllabus (2024-2026).

3.1.1 — Describe the climate of Antarctica.
3.1.2 — Explain the Antarctic food chain.
3.1.3 — Identify animal adaptations.

Antarctic climate

Coldest, driest, windiest continent.

Cold (~−50°C inland). Lowest recorded: −89.2°C. Coastal areas warmer (−10 to 0°C). 6 months of dark or 24-hour light per year (poles).

Polar DESERT. Most areas receive <50mm precipitation/year — less than the Sahara. World's largest desert.

High winds. Katabatic winds: cold dense air flows down from the polar plateau, often >100 km/h.

Reasons.

HIGH LATITUDE → low sun angle, little solar energy per m².
HIGH ALBEDO of ice/snow → ~80% reflected.
HIGH ALTITUDE (avg 2,500m).
CONTINENTAL interior → distance from sea moderating effects.

Cambridge tip. Mark scheme rewards memorising the four reasons with brief explanations.

Cold ~−50°C inland.
Polar desert <50mm rainfall.
High albedo and high altitude.
Katabatic winds from plateau.

See the full worked example for the antarctic ecosystem part 1 →

Antarctic food chain

Phytoplankton → krill → fish/seals/penguins → whales.

Phytoplankton. Microscopic marine plants. Primary producers — base of the chain. Photosynthesise using sunlight + nutrients.

Krill. Small shrimp-like crustaceans. KEYSTONE species. Densities up to 30 kg/m³ in summer blooms.

Fish, squid, penguins, seals. Primary consumers of krill. Penguins feed underwater on krill and fish.

Whales, leopard seals, orcas. Top predators. BALEEN whales filter krill (humpback, blue, fin, minke); TOOTHED whales hunt larger prey.

10% rule. Only ~10% of energy passes from one trophic level to next. Heat, respiration, waste consume the rest.

Cambridge tip. Memorise the full chain. Mark scheme awards a mark for each correctly named level.

Five trophic levels: phytoplankton, krill, mid predators, top predators.
Krill = keystone.
10% energy passes up each step.

See the full worked example for the antarctic ecosystem part 1 →

Animal adaptations to cold

Blubber, fur, huddling, counter-current — five-plus strategies.

Blubber / thick fat. Insulates against cold (seals, whales). Can be 30+ cm thick.

Thick fur / dense feathers. Penguins have layered feathers + downy underneath. Seals have dense fur or fur+blubber.

Huddling behaviour. Emperor penguins huddle in winter (−40°C); inside the huddle can be +30°C. Rotate positions.

Counter-current heat exchange. Arteries (warm blood from heart) run close to veins (cold blood returning) in flippers/feet. Heat transfers; only cooled blood reaches extremities. Saves energy.

Compact body, small extremities. Reduces surface area exposed to cold (Bergmann's rule).

Migration. Some birds (Arctic tern!) and whales migrate north for winter.

Cambridge tip. Mark scheme rewards FIVE-plus adaptations named with brief explanations.

Blubber + fur + feathers — insulation.
Huddling — shared warmth.
Counter-current — heat retention.
Compact body, migration — additional.

See the full worked example for the antarctic ecosystem part 1 →

How it’s examined

Antarctic ecosystem appears on most Paper 1s. Most-tested: climate (5-6 marks), food chain (5 marks), adaptations (5-6 marks).

Sources: Cambridge IGCSE Geography 0460 syllabus (2024-2026); 0460 Examiner Reports 2022-2024; 0460/12 May/Jun 2024 question paper and mark scheme. Last reviewed 2026-05-09.

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Step-by-step worked examples — The Antarctic Ecosystem Part 1

Step-by-step solutions to past-paper-style questions on the antarctic ecosystem part 1, written exactly the way a tutor would explain them at the board.

1Antarctic climate (6 marks)
Extended• Adapted from 0460/12 May/Jun 2024• antarctic
Question
Describe the climate of Antarctica. State THREE reasons why it is so cold. (6 marks)
Step-by-step solution
1. Step 1
  Climate (2 marks). Antarctica is the COLDEST continent — annual mean around −50°C inland; lowest recorded temperature −89.2°C. Very LOW rainfall (most areas <50mm/year — technically a polar desert). High winds and 6 months of darkness per year in some areas.
2. Step 2
  High latitude (1 mark). Sun angle very low (or below horizon for months); little incoming solar radiation per square metre.
3. Step 3
  Ice cover albedo (2 marks). Snow and ice REFLECT ~80% of incoming solar radiation (high ALBEDO), so heating is minimal.
4. Step 4
  Altitude and continentality (1 mark). Average elevation ~2,500m; high inland plateau. Distance from oceans means less heat moderation.
Answer
Antarctica: very cold (−50°C inland), polar desert (<50mm rainfall), high winds. Cold from: high latitude, high albedo from ice, high altitude, continental interior.
2Antarctic food chain (5 marks)
Extended• ecosystem
Question
Describe the Antarctic marine food chain. Identify the KEY species at each level. (5 marks)
Step-by-step solution
1. Step 1
  Phytoplankton (1 mark). Microscopic plants in the ocean (PRIMARY PRODUCERS). Convert sunlight and nutrients into biomass via photosynthesis.
2. Step 2
  Krill (2 marks). Small shrimp-like crustaceans. PRIMARY CONSUMERS that feed on phytoplankton. The keystone species — Antarctic ecosystem depends on krill.
3. Step 3
  Fish, squid, penguins, seals (1 mark). SECONDARY CONSUMERS feeding on krill.
4. Step 4
  Whales and leopard seals (1 mark). TERTIARY CONSUMERS / TOP PREDATORS. Baleen whales filter krill; toothed whales (orcas) and leopard seals hunt larger prey.
Answer
Phytoplankton → krill → penguins/seals/fish → whales/orcas. Krill are the keystone species.
3Animal adaptations to cold (5 marks)
Extended• adaptations
Question
Describe FIVE adaptations Antarctic animals have for living in cold conditions. (5 marks)
Step-by-step solution
1. Step 1
  Blubber / thick fat layer (1 mark). Insulates against cold (seals, whales).
2. Step 2
  Thick fur / dense feathers (1 mark). Insulating layer (penguins, seals).
3. Step 3
  Huddling behaviour (1 mark). Emperor penguins huddle to share body warmth in winter.
4. Step 4
  Counter-current heat exchange (1 mark). Vascular system in flippers/feet retains body heat — arteries running close to veins exchange heat.
5. Step 5
  Compact body / small extremities (1 mark). Reduces surface area exposed to cold (Bergmann's and Allen's rules).
Answer
Blubber, thick fur/feathers, huddling, counter-current heat exchange, compact body. Other: migration, fat storage.

Key Definitions and Keywords — The Antarctic Ecosystem Part 1

Definitions to memorise and the exact keywords mark schemes credit for the antarctic ecosystem part 1 answers — sharpened from recent examiner reports for the 2026 0460 sitting.

Ecosystem
Examiner keyword
A community of living organisms interacting with each other and with their physical environment.
Food chain
Examiner keyword
Sequence of organisms in which each feeds on the next: producer → primary consumer → secondary consumer → top predator.
Keystone species
Examiner keyword
A species the whole ecosystem depends on. In Antarctica: KRILL.
Phytoplankton
Examiner keyword
Microscopic marine plants. Primary producers — base of marine food chains. Photosynthesise in surface waters.
Krill
Examiner keyword
Small shrimp-like crustaceans. Feed on phytoplankton. Primary consumer; keystone Antarctic species.
Albedo
Examiner keyword
Percentage of solar radiation reflected by a surface. Snow/ice ~80% (high); ocean ~6% (low).
Polar desert
Cold region with very low precipitation (<250mm/yr). Antarctica is the world's largest desert.

Common Mistakes and Misconceptions — The Antarctic Ecosystem Part 1

The traps other students keep falling into on the antarctic ecosystem part 1 questions — taken from recent Cambridge IGCSE 0460 examiner reports and mark schemes — and how to avoid them.

✕Calling Antarctica a 'frozen continent' rather than a desert
0460 Examiner Reports 2022-2024
Why it happens
Most deserts feel hot.
How to avoid it
DESERT is defined by RAINFALL (<250 mm/year), not temperature. Antarctica receives <50 mm/year in most areas — a polar desert.
✕Listing food chain without identifying keystone
Why it happens
Default sequence focus.
How to avoid it
Krill are the KEYSTONE — the whole ecosystem depends on them. Their loss would cascade.

Practice questions

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The Antarctic Ecosystem Part 1

Short Study Notes in the form of Slides

Detailed Study Notes

What you’ll learn

How it’s examined

1Antarctic climate (6 marks)

2Antarctic food chain (5 marks)

3Animal adaptations to cold (5 marks)

Ecosystem

Food chain

Keystone species

Phytoplankton

Krill

Albedo

Polar desert

✕Calling Antarctica a 'frozen continent' rather than a desert

✕Listing food chain without identifying keystone

Practice questions

Past paper style quiz

Assess your understanding