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Q1Environment·Forests, Wetlands and Coastal EcologyPYQ 2026
Which of the following best explain(s) the rationale for protecting mangrove ecosystems in the context of climate resilience?
1. Mangroves reduce tidal energy and store freshwater, making them ideal sites for paddy cultivation in saline estuarine belts.
2. Their salt-sensitive roots filter seawater, making mangroves key to converting coastal land into freshwater aquaculture zones.
3. By withstanding tidal surges and offering biomass resources, mangroves function both as natural bio-shields and livelihood bases for rural communities.
Select the answer using the code given below:
- A1 only
- B1 and 2
- C2 and 3
- D3 onlyCorrect
Explanation
UPSC provisional key: (D), Series A question 23. Mangroves buffer waves, storm surges and coastal erosion while supporting fisheries and other community resources. Those combined protective and livelihood functions explain statement 3. Their salt-tolerant adaptations do not imply that surrounding saline soils and waters become freshwater agricultural sites, so statements 1 and 2 are unsuitable reasons for protection.
Sources: UPSC provisional answer key · UNEP — Mangrove forests · UNEP — Mangroves as storm protection and fish habitat
Why the other options are incorrect
- Option A
Mangroves can dissipate wave and tidal energy, but that does not make saline mangrove belts freshwater stores ideal for paddy. A true protective function is attached here to an unjustified land-conversion claim.
- Option B
Both selected statements confuse mangrove adaptations with changing the whole coastal habitat into freshwater farmland or aquaculture. Mangroves live in saline or brackish conditions; protecting them is not equivalent to clearing them for freshwater production.
- Option C
Statement 3 correctly links protection and livelihoods, but statement 2 describes the roots as salt-sensitive and treats filtration as ecosystem-scale desalination. Salt regulation by a plant does not convert the estuary into a freshwater aquaculture zone.
Q2Environment·Forests, Wetlands and Coastal EcologyPYQ 2018
Consider the following statements:
1. Most of the world's coral reefs are in tropical waters.
2. More than one-third of the world's coral reefs are located in the territories of Australia, Indonesia and Philippines.
3. Coral reefs host far more number of animal phyla than those hosted by tropical rainforests.
Which of the statements given above is/are correct?
- A1 and 2 only
- B3 only
- C1 and 3 only
- D1, 2 and 3Correct
Explanation
Correct. Coral reefs occur predominantly in warm tropical waters, the three named territories together hold over one-third of global reef area, and ocean reefs support roughly 32 of the 34 known animal phyla compared to about 9 in tropical rainforests.
Why the other options are incorrect
- Option A
This omits statement 3, which is also correct because marine environments harbour far more animal phyla than terrestrial rainforests.
- Option B
Statements 1 and 2 are also correct; coral reefs are overwhelmingly tropical and the Coral Triangle nations plus Australia hold over a third of global reef area.
- Option C
Statement 2 is also correct; Australia alone accounts for roughly 17 percent of global coral reef area and combined with Indonesia and the Philippines the share exceeds one-third.
Q3Environment·Forests, Wetlands and Coastal EcologyPYQ 2016
What is/are unique about 'Kharai Camel', a breed found in India?
1. It is capable of swimming up to three kilometres in seawater.
2. It survives by grazing on mangroves.
3. It lives in the wild and cannot be domesticated.
Select the correct answer using the code given below.
- A1 and 2 onlyCorrect
- B3 only
- C1 and 3 only
- D1, 2 and 3
Explanation
Correct. The Kharai Camel of Kutch can swim long distances in coastal waters and feeds on mangrove vegetation; however, it is a domesticated breed reared by Jat and Rabari pastoralists.
Why the other options are incorrect
- Option B
Statements 1 and 2 are also correct; the breed's aquatic ability and mangrove diet are its defining features.
- Option C
Statement 3 is incorrect because the Kharai is a domesticated pastoral breed, not a wild animal.
- Option D
Statement 3 is wrong; the Kharai Camel has been traditionally reared by pastoral communities in Gujarat.
Q4Environment·Forests, Wetlands and Coastal EcologyPYQ 2015
Which one of the following regions of India has a combination of mangrove forest, evergreen forest and deciduous forest?
- ANorth Coastal Andhra Pradesh
- BSouth-West Bengal
- CSouthern Saurashtra
- DAndaman and Nicobar IslandsCorrect
Explanation
Correct. The Andaman and Nicobar Islands have extensive mangroves along the coast, tropical wet evergreen forests in the interior, and deciduous forests at lower elevations, making them the only listed region with all three types.
Why the other options are incorrect
- Option A
North Coastal Andhra Pradesh has some mangroves in the Godavari delta but lacks significant evergreen forest cover.
- Option B
South-West Bengal has the Sundarbans mangroves but its hinterland forests are predominantly deciduous, not evergreen.
- Option C
Southern Saurashtra is largely dry scrubland and thorn forest with very limited mangrove patches.
Q5Environment·Forests, Wetlands and Coastal EcologyPYQ 2014
Which of the following have coral reefs?
1. Andaman and Nicobar Islands
2. Gulf of Kachchh
3. Gulf of Mannar
4. Sunderbans
Select the correct answer using the code given below.
- A1, 2 and 3 onlyCorrect
- B2 and 4 only
- C1 and 3 only
- D1, 2, 3 and 4
Explanation
Correct. Andaman and Nicobar Islands, Gulf of Kachchh and Gulf of Mannar are the three major coral reef regions of India. The Sunderbans is a mangrove-dominated delta with high turbidity and freshwater inflow, which is unsuitable for coral reef formation.
Why the other options are incorrect
- Option B
Andaman and Nicobar Islands and Gulf of Mannar also have well-documented coral reefs; the Sunderbans does not.
- Option C
Gulf of Kachchh also possesses significant coral reefs, the northernmost reef system in the Indian Ocean.
- Option D
The Sunderbans lacks coral reefs because its muddy, brackish waters and high sediment load prevent coral growth.
Q6Environment·Forests, Wetlands and Coastal EcologyPYQ 2011
The 2004 Tsunami made people realize that mangroves can serve as a reliable safety hedge against coastal calamities. How do mangroves function as a safety hedge?
- AThe mangrove swamps separate the human settlements from the sea by a wide zone in which people neither live nor venture out.
- BThe mangroves provide both food and medicines which people are in need of after any natural disaster.
- CThe mangrove trees are tall with dense canopies and serve as an excellent shelter during a cyclone or Tsunami.
- DThe mangrove trees do not get uprooted by storms and tides because of their extensive roots.Correct
Explanation
Correct. The dense, interlocking prop and pneumatophore root systems of mangroves anchor them firmly in soft sediment, enabling them to withstand and attenuate the force of storm surges and tsunami waves.
Why the other options are incorrect
- Option A
This describes spatial separation but does not explain the physical mechanism by which mangroves dissipate wave energy.
- Option B
Post-disaster food and medicine supply is not the safety-hedge function referred to in the question.
- Option C
Mangrove trees are generally not tall with dense overhead canopies; their protective role comes from root systems, not from canopy shelter.
Q7Environment·Forests, Wetlands and Coastal EcologyPYQ 1996
Assertion (A): Mangroves are very specialised forest ecosystems of tropical and subtropical regions bordering certain sea coasts.
Reason (R): They stabilise the shoreline and act as a bulwark against encroachments by sea.
In the context of the above two statements, which one of the following is correct?
- ABoth A and R are true and R is the correct explanation of ACorrect
- BBoth A and R are true but R is not a correct explanation of A
- CA is true but R is false
- DA is false but R is true
Explanation
Correct. Mangroves are indeed specialised coastal forest ecosystems of the tropics and subtropics, and their ability to stabilise shorelines through sediment trapping and wave attenuation is a key reason for their existence in these coastal zones.
Why the other options are incorrect
- Option B
R does correctly explain A; mangroves occupy coastal borders precisely because their root systems trap sediment and protect coasts.
- Option C
R is true; mangroves are well documented as shoreline stabilisers.
- Option D
A is true; mangroves are a recognised specialised ecosystem found along tropical and subtropical coasts.
Q8Environment·Forests, Wetlands and Coastal Ecology
The Sundarbans mangrove forest is shared between India and which other country?
- AMyanmar
- BSri Lanka
- CBangladeshCorrect
- DIndonesia
Explanation
Correct. The Sundarbans spans the Ganges-Brahmaputra delta, with roughly 60 percent in Bangladesh and 40 percent in India (West Bengal).
Why the other options are incorrect
- Option A
Myanmar has its own mangrove systems (e.g., Ayeyarwady delta) but they are not part of the Sundarbans.
- Option B
Sri Lanka has mangroves but is an island nation distant from the Ganges-Brahmaputra delta.
- Option D
Indonesia's mangroves are in Southeast Asia and unrelated to the Sundarbans.
Q9Environment·Forests, Wetlands and Coastal Ecology
Which of the following statements about mangrove ecosystems is/are correct?
1. Mangroves are found only along India's eastern coast.
2. Mangroves act as carbon sinks and can sequester carbon at rates higher than most terrestrial forests.
3. Mangrove forests support both marine and terrestrial food webs.
Select the correct answer using the code given below.
- A2 and 3 onlyCorrect
- B1 and 2 only
- C3 only
- D1, 2 and 3
Explanation
Correct. Mangroves are found on both coasts of India (western coast examples include Gujarat and Maharashtra). They are efficient blue-carbon sinks and support interconnected marine-terrestrial food webs.
Why the other options are incorrect
- Option B
Statement 1 is wrong; significant mangroves exist along India's western coast, especially in the Gulf of Kachchh.
- Option C
Statement 2 is also correct; mangroves sequester carbon in biomass and sediments at high rates.
- Option D
Statement 1 is incorrect; India has mangroves on both its eastern and western coasts.
Q10Environment·Forests, Wetlands and Coastal Ecology
Which of the following statements about the relationship between mangroves and fisheries is correct?
- AMangroves have no connection with marine fisheries productivity
- BMangroves serve as nursery and breeding grounds for many commercially important fish and shrimp speciesCorrect
- CMangroves reduce fish populations by consuming fish larvae
- DMangroves support only freshwater fish species
Explanation
Correct. Mangrove root systems provide sheltered nursery habitats for juvenile fish, shrimp and crabs; an estimated 75 percent of commercially caught tropical fish and shellfish spend part of their life cycle in mangroves.
Why the other options are incorrect
- Option A
Multiple studies have demonstrated a strong positive correlation between mangrove area and near-shore fishery yields.
- Option C
Mangroves are plants; they do not consume fish larvae.
- Option D
Mangroves are coastal ecosystems that primarily support brackish and marine species, not solely freshwater fish.
Q11Environment·Forests, Wetlands and Coastal Ecology
Which of the following is the correct sequence of mangrove species zonation from the seaward edge to the landward edge in a typical Indian mangrove forest?
- AAvicennia — Rhizophora — Bruguiera
- BRhizophora — Avicennia — BruguieraCorrect
- CBruguiera — Rhizophora — Avicennia
- DAvicennia — Bruguiera — Rhizophora
Explanation
Correct. In a typical zonation, Rhizophora (with stilt roots) colonises the outermost seaward zone, Avicennia occupies the middle zone, and Bruguiera and other species dominate the landward fringe.
Why the other options are incorrect
- Option A
Avicennia is generally not the outermost pioneer at the seaward fringe in well-developed mangrove systems.
- Option C
This sequence is reversed; Bruguiera is a landward species, not a seaward pioneer.
- Option D
This does not reflect the standard zonation pattern observed in Indian mangroves.
Q12Environment·Forests, Wetlands and Coastal Ecology
Which one of the following is a characteristic feature of coral polyps?
- AThey are autotrophic organisms that produce their own food through chemosynthesis.
- BThey are tiny, soft-bodied animals belonging to phylum Cnidaria that secrete a hard calcium carbonate skeleton.Correct
- CThey are large, mobile crustaceans that build reef structures from chitin.
- DThey are colonial algae that deposit silica to form reef frameworks.
Explanation
Correct. Coral polyps are cnidarian animals (related to jellyfish and anemones) that extract calcium and carbonate from seawater to build rigid limestone skeletons, which accumulate over time to form reefs.
Why the other options are incorrect
- Option A
Coral polyps are heterotrophic animals, not chemosynthetic autotrophs.
- Option C
Corals are cnidarians, not crustaceans, and their skeleton is calcium carbonate, not chitin.
- Option D
Corals are animals, not algae, and their skeleton is calcareous, not siliceous.