Nature & Environment – Comprehensive Study Notes (Grade 10)

Figure 6.1 – Guiding Questions

  • Estimate total population of depicted wildlife in Nepal; useful for contextualizing national conservation status.
  • Discuss human dependency on these animals (ecological balance, tourism, cultural value) and the consequences of their decline.
  • Probe daily‐rising surface temperature: link to excess \text{CO}2, \text{CH}4, urban heat-island effect, deforestation, industrial growth.
  • Explore visual of snow-free mountains → glacial retreat; preventive actions: emission cuts, afforestation, sustainable tourism.
  • Debate relevance of traditional herbal medicine alongside modern pharmacology; examine complementarity, affordability, cultural continuity, bioprospecting ethics.

Biodiversity & Habitat Integrity

  • Earth hosts myriad plant & animal species; their survival hinges on intact environments.
  • Rapid modernization ➔ habitat fragmentation, pollution, climatic anomalies.
  • Nepal harbours many rare taxa; stewardship ensures inter-generational knowledge & resource use.
  • Medicinal flora: plants whose parts yield therapeutic compounds; cornerstone of Ayurvedic practice.

6.1 Climate Change

1 Definition & Core Idea

  • Climate = 30-year averaged weather pattern for a region.
  • Climate change = long-term statistical shift in temperature, precipitation, etc., driven by natural variability and anthropogenic forcing.
  • In Nepal, mean temperature rises at 0.06^{\circ}\text{C}\,\text{yr}^{-1}.

2 Natural Drivers

  • Solar activity: fusion output fluctuation alters incoming solar radiation.
  • Albedo change: only ≈30 % solar energy reflected; melting ice lowers reflectivity, accelerates warming (positive feedback).
  • Volcanism: ash & \text{SO}2 aerosols block sunlight (short-term cooling) while emitted \text{CO}2 sustains long-term warming.

3 Human-Induced Drivers

  • Combustion of fossil fuels (coal, oil, gas) for power & transport → large \text{CO}_2 flux.
  • Industrialization: cement, steel, plastics production add greenhouse gases (GHGs).
  • Deforestation: removes carbon sink; raises atmospheric \text{CO}_2.
  • Vehicular emissions: pervasive in urban Nepal; release NOx, CO, particulate matter along with \text{CO}_2.

4 Observed / Projected Impacts

  • Droughts & floods: altered monsoon, erratic rainfall, crop loss ➔ food insecurity.
  • Sea-level rise via thermal expansion + meltwater; threatens global coastal ecosystems.
  • Biodiversity stress: phenological shifts, habitat range shifts, extinction risk.
  • Human health: skin disorders, vector-borne diseases, malnutrition, mental stress.
  • Weather anomalies: off-season downpours, prolonged dry spells, increased forest fires.

5 Mitigation & Adaptation Measures

  • Cut carbon emissions: energy efficiency, renewables (solar, wind), efficient transport.
  • Enhance carbon sinks: afforestation, REDD+ schemes; forests act as biological reservoirs.
  • Behavioural change & awareness: community education, eco-friendly practices.
  • Policy framework: Environmental Protection Act 2076 enables all governance levels + private sector to issue mitigation directives.

6.2 Endangered Flora & Fauna of Nepal

  • Rare / endangered = species poised to vanish without intervention.
  • Decline drivers:
    • climate disruption altering distribution patterns,
    • over-harvest of biological resources,
    • introduction of exotic species without risk study (plants & livestock),
    • environmental pollution.
  • Biodiversity underpins ecosystem services, livelihoods, cultural heritage.

6.3 Conservation of Endangered & Rare Plants

  • Natural-habitat protection: curb forest fires, overgrazing, fuelwood extraction; designate conservation zones.
  • Regulated harvest: mindful collection of industrial raw materials; anti-smuggling enforcement.
  • Propagation technologies: nursery seed trials, \text{in vitro} tissue culture ➔ mass sapling production.
  • Legislation: “Control of International Trade of Endangered Wild Fauna and Flora Act 2073” plus supportive bylaws; public dissemination.
  • Medicinal awareness: community training on therapeutic value, sustainable harvest, local stewardship.

6.4 Wildlife Conservation Measures

  • Research & monitoring: population census, habitat mapping, ecological studies.
  • Habitat conservation: protect forests, watersheds, corridors; promote landscape connectivity.
  • Anti-poaching: stringent patrols, legal penalties, trans-boundary cooperation.
  • Ex-situ programmes: zoos, aquaria, captive breeding, seed banks for genetic rescue.
  • Legislative enforcement: operationalize existing wildlife acts; deter illegal trade.
  • Public participation: outreach, citizen science, community-based conservation.

Protected Species Inventory (legal shield)

  • Mammals (27): e.g.
    • Bengal Tiger, One-horned Rhinoceros, Red Panda, Snow Leopard, Gangetic Dolphin, Wild Water Buffalo, Brown Bear, etc.
  • Birds (9): Great Hornbill, Sarus Crane, Bengal Florican, Impeyan Pheasant, etc.
  • Reptiles (3): Gharial, Asiatic Rock Python, Golden Monitor Lizard.

6.5 Traditional Medicinal Plants of Nepal

Nepal hosts >7000 flowering plants; >700 confirmed medicinal. Karnali region holds the highest diversity.

Key Species, Parts Used & Therapeutic Highlights

  • Holy Basil (Tulsi) – Ocimum tenuiflorum
    • Whole plant; antimicrobial, appetite stimulant, water purifier.
    • Cultural: kept near dying persons for oxygen release.
  • Neem – Azadirachta indica
    • Leaves, bark, roots; blood purifier, antihyperlipidemic, dermatological remedy.
    • Caution: overuse ➔ hypotension.
  • Heart-leaved Moonseed (Gurjo) – Tinospora cordifolia
    • Stem cuttings propagate; immuno-booster, antioxidant; excess lowers blood sugar.
  • Asiatic Pennywort (Ghod Tapre) – Centella asiatica
    • Entire herb; neuroprotective, memory enhancer, wound healer, cosmetic ingredient.
  • Turmeric – Curcuma longa
    • Rhizome rich in curcumin; antimicrobial, anti-inflammatory, natural dye, immunity enhancer.
  • Malabar Nut (Asuro) – Adhatoda vasica
    • Leaves/flowers brewed or gargled; relieves respiratory congestion, urinary burn; manure source after pruning.
  • Calamus (Bojo) – Acorus calamus
    • Rhizome aromatic; throat soother, analgesic, digestive aid (excess ➔ epistaxis).
  • Caterpillar Fungus (Yarsagumba) – Cordyceps sinensis
    • Altitude 3000–5000\,\text{m}; composite of fungus + mummified larva ((5–8\,\text{cm})).
    • Energy tonic; government restricts harvest & trade.
  • Mugwort (Tite Paati) – Artemisia vulgaris
    • Used for essential oil, natural pesticide, cattle bedding.
  • Aloe Vera (Ghiu Kumari) – Aloe vera
    • Leaf gel; vitamins A & C; skin hydration, sunburn relief, anti-dandruff, digestive aid; revered as “Sanjivani”.

Commercial & Ethical Dimensions

  • Potential rural income source through cultivation / processing.
  • Intellectual-property concerns: protect indigenous knowledge, ensure benefit-sharing.
  • Sustainable harvest protocols prevent resource depletion.

Cross-Connections & Real-World Relevance

  • Climate mitigation supports biodiversity conservation; intact forests both sequester carbon and harbour medicinal species.
  • Traditional herbal knowledge complements modern drug discovery (bioprospecting).
  • Socio-economic equity: climate impacts hit resource-dependent communities hardest; conservation initiatives must integrate livelihoods (community forestry, ecotourism).
  • Ethical imperative: preserving species upholds ecological balance, cultural heritage, and option value for future pharmaceuticals.

Numerical / Statistical Recap

  • Average climate baseline period: \approx30\,\text{years}.
  • Nepal warming rate: 0.06^{\circ}\text{C}\,\text{yr}^{-1}.
  • Solar radiation absorption: 70\,\% of incoming flux.
  • Yarsagumba altitude: 3000–5000\,\text{m}; length 5–8\,\text{cm}.
  • Protected fauna: 27 mammals, 9 birds, 3 reptiles.
  • Flora diversity: >7000 flowering plants; >700 medicinal.

Action-Oriented Learning Tasks

  • Activity 6.1: Document local climate-related environmental changes.
  • Activity 6.2: Create posters on mountain, hill, terai climate impacts.
  • Activity 6.3: Design mitigation measure chart & art exhibition.
  • Project 6.1: PowerPoint on climate change sources/effects.
  • Project 6.2: Survey elders on vanished species; analyze causes & personal conservation roles.
  • Project 6.3/6.4: Compile herbarium-style notebook of local medicinal plants; report on their conservation.