Agriculture, Minerals & The Americas (Economic & Regional Geography) — Practice

Question 1

State TWO differences between subsistence farming and commercial farming.

Accepted Answer

Step 1 — Purpose: Subsistence farming = food grown for the FARMER'S OWN FAMILY. Commercial farming = food grown for SALE in the market.

Step 2 — Scale and tools: Subsistence = small land, traditional tools, little or no machinery. Commercial = large farms, heavy machinery (tractors, combines), high investment.

✦ Answer: (1) Purpose: subsistence = own consumption; commercial = market sale. (2) Scale/technology: subsistence = small + traditional; commercial = large + mechanised.

Question 2

Explain why rice is grown in India and Indonesia but wheat is grown in Russia and Canada. What crop conditions explain this pattern?

Accepted Answer

Step 1 — Rice conditions: Rice needs HIGH temperature (25–35°C) and HIGH rainfall (150–200 cm). It is grown in tropical and subtropical regions with wet climates.

Step 2 — India and Indonesia: Both are tropical countries with high temperatures and monsoon rainfall → ideal for rice cultivation.

Step 3 — Wheat conditions: Wheat needs a COOL growing season and MODERATE rainfall (50–100 cm). It thrives in temperate regions.

Step 4 — Russia and Canada: Both have temperate climates with cool summers and moderate rain → ideal for wheat.

✦ Answer: Rice needs heat and heavy rain (tropical climates → India, Indonesia). Wheat needs cool temperatures and moderate rain (temperate climates → Russia, Canada). Geography and climate determine what crops grow where.

Question 3

What was the Green Revolution in India? What did it achieve — and what did it cost?

Accepted Answer

Step 1 — What it was: The Green Revolution (1960s–70s) introduced HIGH-YIELDING VARIETY (HYV) seeds, combined with chemical fertilisers and improved irrigation, into Indian farming.

Step 2 — What it achieved: Dramatic increase in wheat and rice production. India became FOOD SELF-SUFFICIENT for the first time — able to feed its entire population without importing grain. Millions were saved from famine.

Step 3 — Who led it: M.S. Swaminathan is called the 'Father of the Green Revolution in India.'

Step 4 — What it cost: Groundwater depletion (wells ran dry from over-irrigation). Chemical pollution of soil and water from excessive fertiliser use. Farmers became dependent on expensive inputs.

✦ Answer: The Green Revolution = HYV seeds + fertilisers + irrigation → India became food self-sufficient (1960s–70s). Benefit: ended famine risk. Cost: groundwater depletion and chemical pollution.

Question 4

Give TWO examples each of metallic, non-metallic, and precious minerals. Why are all minerals called non-renewable resources?

Accepted Answer

Step 1 — Metallic minerals: Iron (used in construction, machinery) and Copper (used in electrical wires, electronics).

Step 2 — Non-metallic minerals: Coal (used as fuel for power stations) and Limestone (used in cement production).

Step 3 — Precious minerals: Gold (used in jewellery and investment) and Diamond (used in jewellery and industrial cutting tools).

Step 4 — Why non-renewable: Minerals formed over millions of years by geological processes. Once extracted and used, they CANNOT be replenished on any human timescale. They are finite — when they run out, they are gone.

✦ Answer: Metallic: iron, copper. Non-metallic: coal, limestone. Precious: gold, diamond. All are non-renewable because they took millions of years to form and cannot be replaced once used.

Question 5

Describe the physical geography of North America by naming and locating: (a) two mountain ranges, (b) the central grassland and why it is famous, (c) the major river system.

Accepted Answer

Step 1 — Western mountains: The ROCKY MOUNTAINS (Rockies) run along the western edge. They are young fold mountains — tall, rugged, and recently formed geologically.

Step 2 — Eastern mountains: The APPALACHIAN MOUNTAINS run along the eastern edge. They are old, eroded mountains — shorter and more rounded than the Rockies.

Step 3 — Central grassland: The PRAIRIES — a vast, flat, fertile grassland in the centre of North America (covering central USA and southern Canada). Called the 'BREADBASKET OF THE WORLD' because they produce enormous quantities of wheat, maize, and other grains for global export.

Step 4 — River system: The MISSISSIPPI-MISSOURI river system is the longest in North America. The Mississippi drains the central plains and flows south into the Gulf of Mexico.

✦ Answer: (a) Rockies (west, young) and Appalachians (east, old). (b) Prairies = central flat fertile grassland = 'Breadbasket of the World' for massive grain production. (c) Mississippi-Missouri = longest river system in North America.

Question 6

Why is the Amazon rainforest called the 'Lungs of the Earth'? What threatens it today — and why should the whole world care?

Accepted Answer

Step 1 — Why 'Lungs of the Earth': The Amazon rainforest covers most of northern South America (mainly Brazil). It is the world's largest tropical rainforest. Through PHOTOSYNTHESIS, its billions of trees absorb carbon dioxide and release oxygen — producing approximately 20% of the world's oxygen. Just as lungs breathe for the body, the Amazon 'breathes' for the planet.

Step 2 — Additional role: The Amazon also absorbs massive amounts of carbon dioxide (a greenhouse gas), helping to regulate Earth's climate and slow global warming.

Step 3 — Threats: DEFORESTATION — trees cut down for logging (timber), cattle ranching (farming land), mining, and roads. Millions of hectares are destroyed every year.

Step 4 — Why the whole world should care: The Amazon's oxygen and climate regulation benefit every country. Loss of the Amazon would accelerate climate change globally, cause mass extinction of species (it contains ~10% of all species on Earth), alter rainfall patterns across South America, and release billions of tonnes of stored carbon into the atmosphere.

✦ Answer: Amazon = 'Lungs of the Earth' because it produces ~20% of Earth's oxygen and absorbs huge amounts of CO₂. Threatened by deforestation. The whole world should care because its destruction would accelerate climate change and mass extinction globally.

Question 7

Distinguish between the Andes and the Himalayas using TWO different superlatives. A student wrote 'the Andes are the highest mountains in the world.' Correct this mistake.

Accepted Answer

Step 1 — The Himalayas: Located in Asia. The HIGHEST mountain range in the world. Contains Mount Everest (8,848 m), the world's highest peak.

Step 2 — The Andes: Located along the western coast of South America. The LONGEST mountain range in the world (~7,000 km, stretching from Venezuela in the north to Argentina/Chile in the south). The highest peak in the Andes is Mount Aconcagua (6,961 m) — the highest peak in the Americas.

Step 3 — Correcting the student: The Himalayas are the HIGHEST mountain range (tallest peaks). The Andes are the LONGEST mountain range. These are two different superlatives — the student confused 'highest' with 'longest.'

✦ Answer: Himalayas = HIGHEST range (Mt Everest, Asia). Andes = LONGEST range (~7,000 km, South America). The student's statement is wrong — the Andes are the longest, not the highest.

Question 8

Why does Brazil speak Portuguese while all other major South American countries speak Spanish? What does this tell us about the role of colonialism in shaping geography?

Accepted Answer

Step 1 — Why Portuguese: In 1494, the Treaty of Tordesillas divided the 'New World' between Spain and Portugal. The portion of South America that became Brazil fell under PORTUGAL's zone, so Portuguese colonised it. All other major South American territories fell under SPAIN's zone.

Step 2 — The colonial legacy: The language a country speaks today is often determined by which European power colonised it 400–500 years ago. Brazil has Portuguese language, Portuguese architecture, and Portuguese-influenced culture. Argentina, Chile, Colombia, Peru, Venezuela etc. have Spanish language and Spanish-influenced culture.

Step 3 — Broader lesson: Colonialism shaped not just borders but languages, religions, legal systems, and economic patterns across the entire world. Geography and history are inseparable.

✦ Answer: Brazil was colonised by PORTUGAL (Treaty of Tordesillas, 1494), so it speaks Portuguese. All other major South American countries were colonised by SPAIN and speak Spanish. This shows how colonialism permanently shaped culture and language worldwide.

Practice — Agriculture, Minerals & The Americas (Economic & Regional Geography)

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