IAS Mains Geog Paper 1 2015 Section A Youtube Lecture Handouts videos available at Examrace Youtube channel

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Watch video lecture on YouTube: IAS Mains Geography Optional 2015 Solutions: Paper 1 Section A IAS Mains Geography Optional 2015 Solutions: Paper 1 Section A
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IAS Geography 2015 Paper Paper1 –Section A

1(a) Attempt a classification of geomorphic processes from the zonal point of view.

  • Mechanism of weathering, erosion and deposition

  • Cycles of erosion

  • Agents of erosion and there active regions

1(b) Discuss as to how frontogenesis contributes to weather instability.

  • Frontogenesis implies formation of fronts: temperature gradient at a level or in a layer due to directional and speed changes in the wind field or increase in horizontal thermal gradient with time.

  • Temperature gradient tightens & thermal wind becomes imbalanced.

  • Geostrophic wind above and below adjust and formation of divergence/convergence regions take place to maintain balance.

1(c) Describe the characteristics of different types of pelagic deposits.

Watch video lecture on YouTube: Ocean Deposits - Learning with 3 Classifications & Mnemonics Ocean Deposits - Learning with 3 Classifications & Mnemonics
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  • Terrigenous

  • Biogenous

  • Hydrogenous

1(d) Explain the characteristics of ecological succession.

  • Systematic process

  • Directional changes

  • Due to changes in physical environment and species population.

  • Predictable changes

  • Changes due to population explosion

  • Primary and Secondary Succession – Due to climate and biotic factors

1(e) Comment on the impact of environmental education on quality of life.

  • Awareness, Knowledge, Skill and Participation

  • Gain in Life Expectancy – Improved survival rate, Decrease in death rate

  • Decrease in disability due to occupational hazards

  • Decrease in health problems due to pollution

  • Decrease in particulate matter, use of fossil fuels, pesticides

  • Focus on renewable sources of energy

2(a) Discuss the contributions of the American School of Subaerial Denudation in geomorphology.

  • Old lands – Revealed by dissection of cover (British – Marine Denudation)

  • Uplands – Surface roughened by erosion (American – Powell, Subaerial denudation)

    The American School of Subaerial Denudation in geomorphology

    Subaerial Denudation in Geomorphology

    The American School of Subaerial Denudation in geomorphology

    Q.2(a) Image

    Q.2(A) Image

    Q.2(a) Image

2(b) What is Potential Evapotranspiration? Explain how it is used in assessing the water balance in an area.

  • Potential evapotranspiration (PE): Ability of the atmosphere to remove water from the surface through the processes of evaporation and transpiration assuming no control on water supply.

  • Actual evapotranspiration (AE): Water that is actually removed from a surface due to the processes of evaporation and transpiration.

  • Crop water need

  • Energy from Sun

  • Wind – by Eddy Diffusion

  • PE low in humid area

  • PE high in arid area

2(c) Discuss the methods of conserving biodiversity for sustainable development.

  • Maintain ecological process and preserve diversity

  • In Situ – Within habitat (Protected area, national park, sanctuaries, biosphere reserve)

  • Ex Situ – Maintenance and breeding of plants and animals in gene bank, botanical garden, cryopreservation and zoos or captive breeding.

  • Identify hot spots

3(a) Discuss the basis of Koppen’s climatic classification. Bring out the salient characteristics of ‘Cs’ type of climate.

Watch video lecture on YouTube: 3 Climatic Classification of India - Geography of India 3 Climatic Classification of India - Geography of India
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3(b) Explain with examples as to how channel dynamics has been responsible for the development of alluvial fans and cones.

Watch video lecture on YouTube: Channel Morphology - Understanding the 5 Simple Ways Channel Morphology - Understanding the 5 Simple Ways
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Avulsion is rapid abandonment of a river

The development of alluvial fans and cones.

The Development of Alluvial Fans and Cones.

The development of alluvial fans and cones.

channel & formation of new river channel

3(c) Classify soils based on their zonal distribution and describe the characteristics of pedocals.

Watch video lecture on YouTube: Zonal Classification of Soil by USDA - 12 Soils Categorized Zonal Classification of Soil by USDA - 12 Soils Categorized
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4(a) Explain the different stages of ecological adaptation of man and bring out the changing balance between man and environment.

  • Ecological Succession – Stages and Causes

  • Changes in relationship between man & environment depends on change in organization and attitude of society.

  • Explain determinism and Possibilism

4(b) “Present-day landforms bear more complexity than simplicity.” Elucidate.

  • Himalayas are more complex that Aravallis.

  • Himalayas – are like living breathing creatures, geosynclinals and active

  • Mid Atlantic Ridge in Atlantic Ocean

4(c) Explain the meridional circulation of the atmosphere and its importance in world climate.

Tricellular Model of Circulation

Watch video lecture on YouTube: 3 Models of Circulation - Palmen Heat Convective Model & Rossby Waves in Climatology 3 Models of Circulation - Palmen Heat Convective Model & Rossby Waves in Climatology
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Convergence at ITCZ – Doldrums (Zones of Action)

Divergence – Subtropical Highs (Zones of Action)

Controls development of tropical cyclone, temperate cyclone, anticyclone and air movements.

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