UPSC CSE 2026 Ecology Previous Year Questions

Consider the following statements about Rhynchostylis retusa (Foxtail orchid):

1. It is an epiphytic orchid.

2. The species is endemic to North-east India.

3. It is the State flower of Arunachal Pradesh and Assam.

Which of the statements given above is/are correct?

Which of the following statements with regard to the arrival of Amur Falcons at Doyang Lake in Nagaland each year from Mongolia is/are correct?

1. It showcases how sustained local conservation efforts can contribute to the arrival and protection of international migratory birds.

2. It reflects the global success of advanced tracking technologies that guide migratory birds back to their stopover sites.

3. It confirms that Amur Falcons have adapted to permanent residency in India due to favourable habitat changes.

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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.

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With respect to the Western Hoolock Gibbons, which of the following statements is/are correct?

1. A Sanctuary in North-east India is home to this ape species listed as Endangered in the International Union for Conservation of Nature (IUCN) Red List.

2. They have specialized brachiation and can easily swing between trees.

3. They possess a strong and heavy build like gorillas, yet are remarkably agile tree climbers.

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