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प्राकृतिक वनस्पति MCQ — 50 अभ्यास प्रश्न उत्तर सहित

50 प्राकृतिक वनस्पति बहुविकल्पीय प्रश्नों का अभ्यास करें, विस्तृत उत्तर और व्याख्या सहित। RAS/RPSC परीक्षा की तैयारी के लिए आदर्श।

50 प्रश्न विश्व भूगोल

Practice Questions

Q1. The Tundra biome is found in:

A Temperate grasslands of Europe
B Deserts of Africa
C Tropical forests of South America
D Arctic regions of North America, Europe, and Asia, with permafrost Correct

Explanation

Tundra is found in Arctic regions (above 60-70°N latitude) in Canada, Alaska, Greenland, Scandinavia, and Siberia, and at high altitudes (Alpine Tundra). Characterized by permafrost, very low temperatures, short growing season, and no trees. Vegetation: lichens, mosses, dwarf shrubs, grasses. Animals: caribou, musk oxen, Arctic fox, polar bears, snowy owl. It is a carbon sink — permafrost melting due to climate change is a major concern.

Q2. Which tree species is commercially known as 'Green Gold' and is the primary source of mahogany timber exported from Central America?

A Swietenia macrophylla (Big-leaf mahogany) Correct
B Tectona grandis (Teak)
C Eucalyptus globulus (Blue gum)
D Dalbergia latifolia (Indian rosewood)

Explanation

Swietenia macrophylla (Big-leaf mahogany) is called 'Green Gold' due to its high commercial value. It is native to tropical forests of Central and South America (Amazon, Belize, Mexico). Listed as Vulnerable on the IUCN Red List due to heavy overexploitation. Listed under CITES Appendix II for international trade regulation.

Q3. Which of the following pairs of tree species and their primary commercial use is INCORRECTLY matched?

A Teak (Tectona grandis) — High-quality furniture, shipbuilding
B Eucalyptus (Eucalyptus globulus) — Paper pulp, essential oils, biofuel
C Birch (Betula spp.) — Plywood, paper, medicinal bark (birch tar)
D Conifer (Pinus sylvestris — Scots Pine) — Turpentine, resin, rubber production Correct

Explanation

Pinus sylvestris (Scots Pine) is used for timber, turpentine and resin — but NOT for rubber production. Natural rubber comes from Hevea brasiliensis (rubber tree), native to the Amazon and cultivated in Southeast Asia (Malaysia, Thailand, Indonesia). Pines produce resin/turpentine (oleoresin). Rubber is an entirely different product from a different tree family (Euphorbiaceae). This is the incorrectly matched pair.

Q4. Which of the following statements about global deforestation is/are CORRECT? 1. Brazil has the highest annual rate of tropical forest loss in absolute terms. 2. The Congo Basin rainforest is the world's second-largest tropical rainforest after the Amazon. 3. Palm oil plantations are a major driver of deforestation in Southeast Asia, particularly in Indonesia and Malaysia. 4. The REDD+ programme is a UN initiative to reduce emissions from deforestation.

A 2, 3 and 4 only
B 1, 2 and 3 only
C 3 and 4 only
D 1, 2, 3 and 4 Correct

Explanation

All four statements are correct. (1) Brazil ranks highest in absolute tropical deforestation (Amazon cattle ranching/agriculture). (2) Congo Basin (~2 million sq km) is second-largest tropical rainforest after Amazon (~5.5 million sq km). (3) Palm oil is the leading deforestation driver in Indonesia/Malaysia — which supply ~85% of global palm oil. (4) REDD+ (Reducing Emissions from Deforestation and Forest Degradation) is a UNFCCC/UN mechanism providing financial incentives for forest preservation.

Q5. Steppes are the grasslands of:

A South Africa
B Brazil
C Australia
D Central Asia/Russia Correct

Explanation

Steppes are the vast temperate grasslands of Central Asia and Russia (Ukraine, Kazakhstan). They are semi-arid with continental climate and support livestock grazing.

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Q6. Match List-I (Vegetation/Biome) with List-II (Characteristic Adaptation) and select the CORRECT answer: List-I — List-II A. Desert Xerophytes — 1. CAM (Crassulacean Acid Metabolism) photosynthesis B. Mangrove Trees — 2. Buttress roots for structural support C. Tropical Rainforest Trees — 3. Sclerophyllous (hard, leathery) leaves D. Mediterranean Shrubs — 4. Pneumatophores for gas exchange

A A-1, B-4, C-2, D-3
B A-1, B-2, C-4, D-3
C A-3, B-4, C-1, D-2
D A-2, B-3, C-4, D-1
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Q7. The Congo (Zaire) River Basin contains the world's second-largest:

A Tundra
B Grassland
C Desert
D Tropical rainforest (after Amazon)
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Q8. Which of the following is the MOST ACCURATE statement about deforestation in the Amazon Basin?

A Industrial logging for timber export is the single largest direct driver of Amazon deforestation.
B Agricultural expansion (cattle ranching and soy cultivation) is the dominant driver of Amazon deforestation, accounting for the vast majority of forest loss.
C The Amazon rainforest has gained net forest cover over the past two decades due to reforestation programs.
D Amazon deforestation has no significant impact on global carbon emissions as the forest regrows rapidly after clearing.
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Q9. The IUCN Red List categorises Cycas beddomei (an Indian cycad) under which threat category, and why is this significant?

A Critically Endangered — it is the only cycad species endemic to India and is protected under Schedule I of the Wildlife Protection Act, 1972.
B Vulnerable — it faces threats from habitat loss but has stable populations in protected areas of Andhra Pradesh.
C Endangered — it is found across multiple southern states including Karnataka, Tamil Nadu and Andhra Pradesh.
D Extinct in the Wild — it survives only in botanical gardens and seed banks.
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Q10. Which of the following INCORRECTLY describes an adaptation of desert vegetation (xerophytes)?

A Thick, waxy cuticle on leaves/stems to reduce transpiration
B Leaves modified into spines to reduce surface area and deter herbivores
C Extremely shallow root systems confined to the top 2 cm of soil to maximize dew absorption
D Succulents store water in fleshy stems or leaves (e.g., cacti, aloe)
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Q11. Arrange the following vegetation zones in the correct order of their occurrence during ALTITUDINAL ZONATION on a tropical mountain, from base to summit:

A Tropical Rainforest → Tropical Deciduous → Temperate Broadleaf → Coniferous/Alpine → Alpine Meadow/Tundra → Permanent Snow
B Tropical Deciduous → Tropical Rainforest → Coniferous → Temperate Broadleaf → Alpine Meadow → Permanent Snow
C Tropical Rainforest → Coniferous → Temperate Broadleaf → Tropical Deciduous → Alpine Meadow → Permanent Snow
D Tropical Rainforest → Tropical Deciduous → Coniferous → Temperate Broadleaf → Alpine Meadow → Permanent Snow
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Q12. Which of the following statements about the REDD+ programme is/are CORRECT? 1. REDD+ stands for Reducing Emissions from Deforestation and Forest Degradation, with the '+' referring to conservation of forest carbon stocks and sustainable forest management. 2. REDD+ is exclusively administered by the IUCN and does not fall under the UNFCCC framework. 3. Developing countries can earn results-based payments for verified reductions in deforestation under REDD+. 4. REDD+ operates on the principle of Payment for Ecosystem Services (PES).

A 1, 3 and 4 only
B 1, 2, 3 and 4
C 2 and 3 only
D 1 and 3 only
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Q13. Which of the following statements about Mangrove forests is/are CORRECT? 1. Sundarbans, shared between India and Bangladesh, is the world's largest mangrove forest. 2. Mangroves exhibit vivipary — seeds germinate while still attached to the parent tree. 3. Pneumatophores are aerial roots that help mangroves absorb oxygen in waterlogged soils. 4. Mangroves are predominantly found on the western coasts of continents.

A 1, 2 and 3 only
B 2 and 3 only
C 1, 2, 3 and 4
D 1 and 3 only
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Q14. Consider the following statements about Mangrove forests: 1. Mangroves grow in the intertidal zones of tropical and subtropical coastlines. 2. Pneumatophores are aerial roots that help mangroves breathe in waterlogged, oxygen-deficient soils. 3. The Sundarbans, shared between India and Bangladesh, is the world's largest mangrove forest. 4. Mangroves are effective carbon sinks, storing up to 4 times more carbon per unit area than tropical rainforests. Which of the following is correct?

A 1, 2 and 3 only
B 1 and 2 only
C 2, 3 and 4 only
D 1, 2, 3 and 4
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Q15. The 'Savanna' grasslands of Africa are also known as:

A Pampas
B Prairies
C Steppes
D Tropical Grasslands/Bushveld

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