21 public questions tagged with this topic.
India occupies about 2.4% of the world's land area but accounts for about 8.1% of the recorded global species diversity, making it one of the 12 megadiverse countries.
Ref: NCERT Class 12 Biology Chapter 13: Biodiversity and Conservation Biodiversity - Levels - Genetic Species Ecological
Himalayas are classified as youngest fold mountains formed during Alpine orogeny by collision of Indian tectonic plate drifting northward with Eurasian plate approximately 50-60 million years ago, closing Tethys Sea. Continuous convergence still raises Himalayas about 5 mm yearly, causing frequent earthquakes and rugged topography with sharp peaks, deep gorges. Rocks are mainly sedimentary, metamorphic unconsolidated compared to ancient Aravallis 2 billion years and Vindhyas. Himalayan youth explains highest elevation Everest 8848 m making them highest range globally. Knowledge of this distribution aids in understanding endemism patterns and UNESCO heritage site designations across India.
Ref: NCERT Geography Young Fold Mountains Himalayas Formation; USGS Plate Tectonics India Collision
Hemis National Park is situated in eastern Ladakh Union Territory on west bank of Indus, encompassing catchments of Markha, Sumdah, Rumbak streams within Zanskar range. Notified 1981, area about 4400 km² extends from 3000 to 6000 meters elevation, including riverine willow-sallow, alpine scrub. Administrative control rests at Leh. Located within Trans-Himalayan biogeographic zone, it represents largest high-altitude protected area in India. Proximity to Hemis Monastery 400 years old blends cultural and biodiversity conservation ethos. Such details are high-yield for NEET and CUET as they link morphological classification with modern molecular phylogeny insights.
Ref: Ladakh Forest Department Hemis National Park Location Zanskar; Wikipedia Hemis NP Largest High Altitude
Trans-Himalayan cold desert is characterized by extreme aridity due to Himalayan rain shadow preventing monsoon penetration, receiving less than 350 mm precipitation largely as snow, high solar radiation, and strong diurnal temperature amplitude exceeding 30°C. Vegetation cover less than 10% consisting of xerophytic shrubs, cushion plants, and ephemeral grasses emerging briefly after snowmelt. Soils skeletal, immature. Productivity limited by low moisture, short growing season three months, and hypoxia above 4000 meters, necessitating specialized physiological adaptations for flora and fauna survival. Mastery of this rule helps candidates differentiate closely related categories and avoid common errors in diversity questions.
Ref: WII Cold Desert Ecosystem Characteristics Trans-Himalaya; Ecology – Trans-Himalayan Vegetation Sparse
Trans-Himalayan biogeographic zone occupies rain-shadow areas north of Great Himalaya, including Ladakh plateau which is high-altitude cold desert, Lahaul-Spiti valleys of Himachal Pradesh, and northern Sikkim and Uttarakhand pockets. Extremely arid, average temperature below freezing many months, sparse vegetation of Caragana scrub, cushion herbs. Biotically Tibetan affinity with Palaearctic realm. Zone includes famous high lakes Tso Moriri, Pangong, and supports black-necked crane breeding, Tibetan wild ass, snow leopard, making it ecologically distinct from Himalayan proper. Examinations emphasize this concept because it underpins correct interpretation of phylogenetic relationships and evolutionary systematics.
Ref: WII Trans-Himalayan Zone Ladakh Lahaul-Spiti Description; Biogeographic Zones of India Textbook
Central secretariat of IUCN is headquartered at Rue Mauverney 28 in Gland, Canton Vaud, Switzerland, near Lake Geneva and Geneva international organizations hub. Gland location in neutral Switzerland facilitates diplomatic engagement among 84 member states, 200 government agencies, and over 1400 NGOs. Offices coordinate Red List assessment process, Commission on Ecosystem Management, environmental law programme, and field projects across 160 countries. Proximity to other UN environmental bodies enhances collaboration for biodiversity policy implementation. Examinations emphasize this concept because it underpins correct interpretation of phylogenetic relationships and evolutionary systematics.
Ref: IUCN Website Contact Headquarters Gland Switzerland; Britannica IUCN Headquarters Location
“Lower extinction rates” for increasing island size generally results in. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. At equilibrium, species identities can continue to turn over even when richness is approximately stable. The model predicts a balance of rates, not an absence of colonization or extinction. The remaining alternatives—“Lower immigration”, “Higher extinction rates”, “No change in biodiversity”—refer to different states, processes, or scales and therefore do not express the same causal relationship. Island biogeography explains species richness as a dynamic balance between immigration and extinction. Immigration generally declines as an island fills with species, whereas extinction rises as more species divide finite area and maintain smaller populations. The cited framing is therefore most useful when treated as a conditional biological claim, with assumptions about scale and environmental context kept explicit. Linking the wording to measurable consequences for fitness, abundance, or flux gives the conclusion its scientific meaning and prevents a purely mnemonic interpretation.
Ref: Biogeography, Lomolino et al., 5th Ed., Ch. 5-8
“Low species richness” for islands far from mainland sources usually have. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. At equilibrium, species identities can continue to turn over even when richness is approximately stable. The model predicts a balance of rates, not an absence of colonization or extinction. The remaining alternatives—“High species richness”, “Rapid colonization rates”, “Stable ecosystems”—refer to different states, processes, or scales and therefore do not express the same causal relationship. Island biogeography explains species richness as a dynamic balance between immigration and extinction. Immigration generally declines as an island fills with species, whereas extinction rises as more species divide finite area and maintain smaller populations. The cited framing is therefore most useful when treated as a conditional biological claim, with assumptions about scale and environmental context kept explicit. Linking the wording to measurable consequences for fitness, abundance, or flux gives the conclusion its scientific meaning and prevents a purely mnemonic interpretation.
Ref: Biogeography, Lomolino et al., 5th Ed., Ch. 5-8
“A 'sea' of unsuitable habitats” for island biogeography can also apply to mainland habitats viewed as islands within. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Island biogeography explains species richness as a dynamic balance between immigration and extinction. Immigration generally declines as an island fills with species, whereas extinction rises as more species divide finite area and maintain smaller populations. The remaining alternatives—“Marine ecosystems”, “Deserts”, “Forest ecosystems only”—refer to different states, processes, or scales and therefore do not express the same causal relationship. Larger islands usually support more habitats and larger populations, lowering extinction risk; less isolated islands receive colonists more readily and may experience rescue effects. These mechanisms also apply to habitat fragments that function as ecological islands. Field observations could test this account by measuring the proposed driver and the demographic or ecosystem response while controlling plausible confounding factors.
Ref: Biogeography, Lomolino et al., 5th Ed., Ch. 5-8
“Low species diversity” for small islands far from the mainland typically have. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Island biogeography explains species richness as a dynamic balance between immigration and extinction. Immigration generally declines as an island fills with species, whereas extinction rises as more species divide finite area and maintain smaller populations. The remaining alternatives—“High species diversity”, “Moderate species diversity”, “No species”—refer to different states, processes, or scales and therefore do not express the same causal relationship. Larger islands usually support more habitats and larger populations, lowering extinction risk; less isolated islands receive colonists more readily and may experience rescue effects. These mechanisms also apply to habitat fragments that function as ecological islands. This distinction matters because similar surface patterns can arise through different mechanisms, whereas ecological prediction depends on identifying the mechanism that actually changes rates.
Ref: Biogeography, Lomolino et al., 5th Ed., Ch. 5-8
“A habitat island” for an 'isolated spring in a desert' is an example of. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Island biogeography explains species richness as a dynamic balance between immigration and extinction. Immigration generally declines as an island fills with species, whereas extinction rises as more species divide finite area and maintain smaller populations. The remaining alternatives—“A marine island”, “A continent”, “An ecological niche”—refer to different states, processes, or scales and therefore do not express the same causal relationship. Larger islands usually support more habitats and larger populations, lowering extinction risk; less isolated islands receive colonists more readily and may experience rescue effects. These mechanisms also apply to habitat fragments that function as ecological islands. Field observations could test this account by measuring the proposed driver and the demographic or ecosystem response while controlling plausible confounding factors.
Ref: Biogeography, Lomolino et al., 5th Ed., Ch. 5-8
“Distribution patterns of species” for biogeography is primarily the study of. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Larger islands usually support more habitats and larger populations, lowering extinction risk; less isolated islands receive colonists more readily and may experience rescue effects. These mechanisms also apply to habitat fragments that function as ecological islands. The remaining alternatives—“Species genetics”, “Marine biology”, “Animal behavior”—refer to different states, processes, or scales and therefore do not express the same causal relationship. At equilibrium, species identities can continue to turn over even when richness is approximately stable. The model predicts a balance of rates, not an absence of colonization or extinction. Linking the wording to measurable consequences for fitness, abundance, or flux gives the conclusion its scientific meaning and prevents a purely mnemonic interpretation. Field observations could test this account by measuring the proposed driver and the demographic or ecosystem response while controlling plausible confounding factors.
Ref: Biogeography, Lomolino et al., 5th Ed., Ch. 1-4
