The SCIENCE QUIZ

1. At a Glance

• The Hindu's "The Science Quiz" of 1 Oct 2026 (Chennai edition, page 18, by Radhika Santhanam) is about forests. Its framing line is that the world faces a "narrowing window" to restore forests that are essential to food security and the climate [1].
• The questions cover rainforest layers, the taiga/boreal biome, underground fungal networks, mangroves (Sundarbans, Pichavaram), a large tropical forest block that houses the critically endangered forest elephant, and a place in India reported to have 0% recorded forest area [1].
• Why UPSC cares: these are standard Prelims themes in Geography (biomes), Environment (ecosystems and forest statistics) and GS-III (conservation, climate change). India's ISFR 2023 and FAO's FRA 2025 provide the current numbers [2][4].

2. Why in the News

• The quiz appeared in the 1 Oct 2026 Chennai edition, framed around the "narrowing window" to restore forests [1].
• FAO's Global Forest Resources Assessment (FRA) 2025 reports that deforestation has slowed in every region over the last decade, but at 10.9 million ha/year it is still too high [5].
• ISFR 2023 was released by Union Environment Minister Bhupender Yadav (PIB, December 2024). It reported gains in both forest cover and tree cover [2][3].

3. Background & Evolution

• Global forest monitoring: FAO runs the Global Forest Resources Assessment. FRA 2025 has its own "Terms and Definitions" working paper (Working Paper 194) and an open data platform [4][6].
• Global trend, 1990–2025:
• Deforestation fell from 17.6 Mha/yr (1990–2000) to 10.9 Mha/yr (2015–2025) [5].

• Net forest loss fell from 10.7 Mha/yr to 4.12 Mha/yr over the same periods [4].

• Indian trend:

• Mangrove cover rose by 509.68 sq km (11.4%) between 2001 and 2023 [2].
• Mangrove cover rose by 363.68 sq km (7.86%) between 2013 and 2023 [2].
• Between ISFR 2021 and ISFR 2023, forest cover rose by 156 sq km and tree cover by 1,289 sq km [2].

4. Core Static Facts

Item	Fact	Src
Global forest area (FRA 2025)	4.14 billion ha, about one-third of the world's land	[4]
Tropical share	Nearly half of the world's forests are in the tropics	[4]
Forests under management plans	More than half	[5]
Forests in legally protected areas	About one-fifth	[5]
India forest + tree cover (ISFR 2023)	8,27,357 sq km = 25.17% of geographical area	[2]
– Forest cover	7,15,343 sq km (21.76%)	[2]
– Tree cover	1,12,014 sq km (3.41%)	[2]
Top 3 states by forest cover (area)	MP (77,073) > Arunachal (65,882) > Chhattisgarh (55,812) sq km	[2]
India mangrove cover	4,991.68 sq km = 0.15% of geographical area	[2]
Top mangrove holders (share of India's mangroves)	West Bengal 42.45% > Gujarat 23.66% > A&N Islands 12.39%	[2]
Mangroves globally	Less than 1% of global tropical forests; roots protect against storms and erosion	[1]
Indian mangrove examples named in the quiz	Sundarbans, Pichavaram	[1]
"Taiga"	Russian for "land of little sticks". Long, severe winters, short summers, coniferous evergreens	[1]
"Wood wide web"	Fungal network under the forest floor that shares nutrients, water and warning signals. The quiz credits the "www" nickname to German forester Peter Wohlleben	[1]
Ministry	MoEFCC releases ISFR and answers Parliament questions on mangroves	[2][3]

Quiz answers. The excerpt does not print the answers. These are the standard textbook answers, and they are not cited to any retrieved source:

• Q1: Canopy
• Q2: Northern Hemisphere; the biome is called Boreal (from Boreas, the Greek god of the north wind)
• Q3: Mycorrhizal network; "www" = "Wood Wide Web"
• Q4: Mangroves
• Q5 (the question is cut off in the excerpt): most likely the Congo Basin rainforest

5. Multi-Dimensional Analysis

Environmental

• Mangroves make up less than 1% of tropical forests but act as coastal buffers against storms and erosion [1].
• India's mangroves grew 11.4% between 2001 and 2023 [2].
• Global net forest loss has fallen but has not stopped (4.12 Mha/yr) [4].

Scientific / Ecological

• Stratification: the top rainforest layer gets the most sunlight and holds most of the species [1].
• Fungal–root symbiosis lets trees share nutrients, water and chemical signals [1].
• The boreal/taiga biome has long, severe winters and coniferous evergreens [1].

Economic / Food security

• The quiz presents forest restoration as essential to food security and the climate [1].
• Mangroves protect coastal livelihoods (PIB feature "Mangroves as Guardians of Life and Livelihoods") [3].

Governance / Administrative

• More than half of the world's forests have long-term management plans, and about one-fifth lie in legally protected areas [5].
• India reports forest cover through ISFR every two years [2].

Geopolitical / Climate

• Nearly half the world's forests are tropical, which ties them to the forest-finance debates in UNFCCC talks [4].
• The quiz's Q5 forest block spans six countries, which makes it a transboundary conservation issue [1].

6. Recent Developments (last 12–18 months)

• 2025: FAO releases FRA 2025. It records the lowest deforestation rate since 1990 but says the rate is still "too high" [4][5].
• April 2025: PIB publishes the feature "Where the Land Meets the Sea: Mangroves as Guardians of Life and Livelihoods" [3].
• 2025: Several Parliament questions on mangrove conservation and restoration are answered by MoEFCC [3].
• 1 Oct 2026: The Hindu publishes "A quiz on forests" around the "narrowing window" for forest restoration [1].

7. Prelims Hooks

• ISFR 2023: India's total forest + tree cover is 25.17% of geographical area [2].
• Forest cover alone is 21.76%; tree cover is 3.41% [2].
• Largest forest cover by area: Madhya Pradesh, then Arunachal Pradesh, then Chhattisgarh [2].
• India's mangrove cover is 4,991.68 sq km, only 0.15% of geographical area [2].
• West Bengal holds 42.45% of India's mangroves, followed by Gujarat (23.66%) [2].
• The A&N Islands rank third in mangrove share at 12.39% [2].
• Between ISFR 2021 and ISFR 2023, tree cover grew far more than forest cover (+1,289 vs +156 sq km) [2].
• FRA 2025: world forest area is 4.14 billion ha, about one-third of land [4].
• Deforestation fell from 17.6 Mha/yr (1990–2000) to 10.9 Mha/yr (2015–2025) [5].
• Net forest loss in 2015–2025 was 4.12 Mha/yr [4].
• About one-fifth of the world's forests are in legally protected areas [5].
• "Taiga" is Russian for "land of little sticks" [1].
• Pichavaram (Tamil Nadu) is a mangrove ecosystem [1].

8. What the Satellite Counts as "Forest" — and What It Misses

• India's forest cover number counts green canopy, not natural forest
• The Forest Survey of India (FSI) uses automated satellite analysis to measure forest cover. Down To Earth reports that this method cannot tell a natural forest from a tree plantation or an orchard [7].
• Experts quoted in the same coverage say rubber and areca plantations and orchards should have been removed after ground-checking. They say these were probably kept in, which pushes the forest number up [7].

• Much of the recorded gain came from commercial plantations such as rubber, and farm trees such as mango and coconut. These support far less wildlife than a natural forest does [7].

• FAO uses a stricter definition

• The FRA 2025 terms exclude land that is mainly used for agriculture, so fruit orchards do not count as forest [6].

• So India's ISFR figure and FAO's FRA figure for India measure different things. Do not compare them directly.

• What the green hides: density is falling inside real forests

• Forest cover rose in ISFR 2023, but degradation and a fall in canopy density (how thickly tree crowns cover the ground) were found inside recorded forests (areas legally notified as forest) [7].
• A dense forest that thins out can still show as "forest cover". So the headline area can rise while forest quality falls.

9. Why a Small Net Gain Can Hide a Large Loss

• Net figures add losses and gains together, so the losses disappear
• Between ISFR 2021 and 2023, tree cover grew by 1,289 sq km but forest cover grew by only 156 sq km [2]. Most of the new green is outside forests.

• At the same time, about 1,500 sq km of unclassed forest was lost, and the report does not explain why [8]. (Unclassed forests are forest lands not notified as reserved or protected, often under revenue or community control. They have the weakest legal protection.)

• Forest land is still being handed over for projects

• The Supreme Court has ordered the Centre and states not to take steps that reduce forest land [10].
• Even so, the government approved clearing over 8,500 hectares of forest in six months [11].

• The old forest is lost now. The replacement plantation takes decades to grow, if it survives at all.

• The same pattern exists at the global level

• FRA 2025: gross deforestation is 10.9 Mha/yr but net loss is only 4.12 Mha/yr [4][5].
• The gap of about 6.8 Mha/yr is new forest (regrowth or planting) that cancels out losses on paper.
• A young plantation does not store the same carbon or hold the same species as the old forest it "replaces". So a falling net-loss number can overstate real progress.

10. Why Replacement Planting Does Not Replace a Forest

• Compensatory afforestation is the main repair tool, and auditors keep finding it weak
• Compensatory afforestation means: when forest land is given for a project, the project pays for new trees to be planted elsewhere. The money goes to CAMPA (Compensatory Afforestation Fund Management and Planning Authority).

• The CAG has audited this system many times — a Union-level audit on compensatory afforestation in 2013 (Report No. 21) [13], and a performance audit of CAMPA in Uttarakhand in 2024 (Report No. 5) [9].

• Wrong trees get planted

• The CAG criticised Odisha for planting eucalyptus, acacia and teak instead of sal, the native tree of its forests [12].

• These fast-growing commercial trees turn the satellite map green quickly. But they do not bring back the original ecosystem, so the forest-cover count improves while the forest itself does not come back.

• What should follow

• FSI should publish plantations, orchards and natural forest as separate categories in ISFR. Down To Earth's critics point to exactly this gap [7].
• MoEFCC and State CAMPAs should plant native species for compensatory afforestation, and report whether saplings survive, not just how many were planted. This follows from the CAG's Odisha finding [12].

11. The Case That India's Green Gain Is Real — and Where It Stops

• The strongest argument for the official view
• ISFR 2023 reports that India's forests and trees keep adding carbon. The government links this to India's NDC (Nationally Determined Contribution — India's climate pledge under the Paris Agreement), which includes creating an extra carbon sink (trees and soil that absorb CO2) of 2.5–3 billion tonnes CO2-equivalent [2].

• Trees on farms and outside forests do absorb carbon and give farmers income. So the tree-cover gain (+1,289 sq km) is not worthless [2].

• What this argument gets right

• For the climate target, carbon absorbed by a rubber or mango tree still counts. The official number is not false. It measures canopy, which is what it says it measures.

• Where it stops

• A plantation can be cut and sold in the next harvest cycle, so its carbon is not stored for long.
• It does not hold the wildlife, water retention or soil of a natural forest [7].
• So the fair reading: India is gaining trees, but it may be losing natural forest in density and area [7][8]. A good Mains answer should say both.

12. Anchors for Answers

• Data: India forest + tree cover 25.17% (ISFR 2023), but the tree-cover gain (+1,289 sq km) is eight times the forest-cover gain (+156 sq km) [2]
• Data: About 1,500 sq km of unclassed forest lost without explanation in the 2023 report [8]
• Data: Global gross deforestation 10.9 Mha/yr vs net loss 4.12 Mha/yr, 2015–2025 (FAO FRA 2025) [4][5]
• Report/Committee: CAG Report No. 21 of 2013 on Compensatory Afforestation [13]; CAG Report No. 5 of 2024, Performance Audit of CAMPA, Uttarakhand [9]; CAG criticism of Odisha's eucalyptus/acacia/teak plantations in place of sal [12]
• Law/Case: Forest (Conservation) Amendment Act, 2023; Supreme Court order telling Centre and states not to reduce forest land [10]
• Comparison: FAO FRA definition excludes land mainly under agricultural use (e.g. orchards) from "forest"; India's ISFR forest cover does not separate them out [6][7]
• Scheme: CAMPA / compensatory afforestation — meant to replace diverted forest, but audits show wrong species and delays [9][12]; MISHTI for mangrove restoration

13. Mains Relevance

• Syllabus mapping:
• GS-I: Physical geography, world distribution of natural resources and biomes.

• GS-III: Conservation, environmental pollution and degradation, EIA; disaster management (mangroves as bio-shields).

• Possible question stems: 1. Forest cover in India has increased, yet forest quality is under question. Critically examine the findings of ISFR 2023. 2. Mangroves cover less than 1% of tropical forests yet deliver outsized ecosystem services. Discuss with reference to India's coastal resilience. 3. Global deforestation has slowed but remains 'too high' (FAO FRA 2025). What measures are needed to close the 'narrowing window' for forest restoration?

14. Related Topics to Study Next

• Forest Survey of India and the ISFR method: the difference between forest cover, tree cover and recorded forest area.
• MISHTI scheme / mangrove restoration: India's policy response on mangroves.
• Bonn Challenge and India's land-restoration pledge: the restoration target behind the "narrowing window".
• REDD+ and UNFCCC forest finance: the climate link.
• Biomes of the world (tropical rainforest, taiga, temperate): the static geography base.
• IUCN Red List categories: the forest elephant's status and the logic of the threat categories.
• Forest (Conservation) Amendment Act, 2023: the legal framework for Indian forests.
• Sundarbans (Ramsar site and World Heritage Site): a transboundary mangrove ecosystem.

15. Common Errors / Trap Areas

• Forest cover vs. recorded forest area vs. tree cover. The quiz's "0% recorded forest area" is a legal-records measure, not a satellite-measured cover figure [1][2].
• Absolute area vs. percentage. Madhya Pradesh leads in forest area [2]. States ranked by percentage of geographical area are a different list.
• Mangrove ranking. West Bengal leads, not Gujarat or the A&N Islands [2]. Mangroves are only 0.15% of India's area [2].
• Deforestation vs. net forest loss. 10.9 Mha/yr is gross deforestation [5]. 4.12 Mha/yr is net loss after forest expansion [4].
• Origin of "Wood Wide Web". The quiz credits it to Wohlleben [1], but the term is generally traced to Nature's 1997 coverage of Suzanne Simard's work. That attribution is not verified here, so treat it with caution.