The Himalayan Mountains – Long Answer Questions
Medium Level (Application & Explanation)
Q1. Explain how the west–east alignment of the Himalayas from the Indus to the Brahmaputra shapes the mountain system.
Answer:
- The Himalayas stretch in a west–east direction from the Indus to the Brahmaputra.
- They cover about 2,400 km in a long arc.
- This gives the range a continuous wall-like shape across northern India.
- It helps mark clear natural boundaries and physical regions.
- At the Brahmaputra, the range bends and turns into the Purvachal.
- This bend shows a change in direction, relief, and local geography.
Q2. Why are the Himalayas called young fold mountains and an unstable zone? Explain with reasons.
Answer:
- They are fold mountains, formed by the collision of landmasses.
- They are geologically young, so the peaks are lofty and sharp.
- The topography is youthful with deep valleys and fast rivers.
- The region is an unstable zone with frequent earth movements.
- This can cause landslides, rockfalls, and river course changes.
- The land is still being uplifted and shaped by natural forces.
Q3. Describe the youthful topography of the Himalayas and its effects on rivers and landforms.
Answer:
- The Himalayas show youthful topography.
- The peaks are high, and the slopes are steep.
- Rivers flow fast, cut deep valleys, and form gorges.
- Erosion is active, so the land changes quickly.
- There are waterfalls, rapids, and V-shaped valleys.
- This creates scope for hydropower but also hazards.
Q4. What is the Purvachal? Explain its location, turn, and composition as given in the content.
Answer:
- Beyond the Brahmaputra, the Himalayas bend sharply to the south.
- This eastern extension is called the Purvachal or Eastern Hills.
- It runs through the northeastern states of India.
- The hills are mostly made of strong sandstones.
- They represent an ancient landmass, as noted in the text.
- The relief is hilly, broken, and rugged in many parts.
Q5. Using the given table of peaks, explain why the Himalayas are called the loftiest mountains of the world.
Answer:
- The table shows many peaks above 8,000 m like Mt. Everest (8848 m).
- Peaks such as Kanchenjunga (8598 m) and Makalu (8481 m) are very high.
- Others like Dhaulagiri (8172 m) and Annapurna (8078 m) also cross 8,000 m.
- Even peaks below 8,000 m, like Nanda Devi (7817 m), are very lofty.
- Such heights across a long range prove their global dominance.
- So the Himalayas are rightly called the loftiest mountain range.
High Complexity (Analysis & Scenario-Based)
Q6. A trekking team plans a route through a Himalayan valley. How should the youthful topography and unstable zone influence their plan?
Answer:
- Plan for steep slopes and deep valleys due to youthful relief.
- Expect fast-flowing rivers and narrow gorges along the route.
- Watch for landslides because it is an unstable zone.
- Choose paths away from rockfall-prone cliffs and loose debris.
- Keep flexible schedules due to sudden weather and terrain changes.
- Place camps on stable ground and near safe water sources.
Q7. A hydropower project is proposed on a Himalayan river. Assess benefits and risks based on the content.
Answer:
- Benefit: Fast-flowing rivers give strong hydropower potential.
- Benefit: Steep gradients allow high head for turbines.
- Risk: The area is an unstable zone with landslides.
- Risk: Sediment load is high due to active erosion.
- Risk: Flash floods can damage infrastructure.
- Plan: Use strong designs, silt management, and safety buffers.
Q8. Compare the main Himalayan range with the Purvachal based on composition and history. Predict impacts on people and land.
Answer:
- Main Himalayas: Young fold mountains with lofty peaks.
- Purvachal: Eastern hills, turning south beyond the Brahmaputra.
- Purvachal is mainly sandstone, linked to ancient landmass.
- Young Himalayas face more uplift and instability.
- Purvachal’s rocks can weather into different soils and slopes.
- Settlements must adapt to rugged terrain, landslides, and access.
Q9. Using the long spread (2,400 km) and high peaks, analyze how the Himalayas support rich life and culture, as mentioned in the conclusion.
Answer:
- A 2,400 km spread creates many climates and habitats.
- High peaks and valleys form diverse micro-regions.
- Rivers from snow and rain support forests and farms.
- Different zones allow varied biodiversity to thrive.
- People develop unique cultures, languages, and livelihoods.
- Thus, the Himalayas are a treasure of nature and heritage.
Q10. Suppose the Himalayas did not bend south into the Purvachal after the Brahmaputra. Predict two physical and two human impacts.
Answer:
- Physical: No sharp bend would change drainage and slope patterns.
- Physical: The eastern hills barrier would be weaker or absent.
- Human: Routes across the northeast might be different and straighter.
- Human: Settlements and land use could spread in new corridors.
- Overall terrain would feel less enclosed in parts of the northeast.
- Local resources and movement patterns would shift accordingly.