Resources and Development — NCERT Solutions

Given: Soil type in river deltas of the eastern coast of India.

Answer:

Alluvial soil is found in the river deltas of the eastern coast (e.g., deltas of Mahanadi, Godavari, Krishna, and Cauvery rivers).

Three main features of alluvial soil:

1. It is very fertile and rich in potash, phosphoric acid, and lime, making it ideal for the growth of sugarcane, paddy, wheat, and other crops.
2. It has a high water-retaining capacity and is found in different textures — sandy loam to clay.
3. It is the most widely spread soil in India, covering the entire Indo-Gangetic Plain and coastal deltas, and is constantly renewed by river deposits (newer alluvium is called Khadar and older alluvium is called Bhangar).

Given: Measures to control soil erosion in hilly areas.

Answer:

The following steps can be taken to control soil erosion in hilly areas:

1. Terrace farming / Contour ploughing: Ploughing along the contour lines reduces the speed of water flow down the slopes, thereby checking soil erosion.
2. Planting trees / Afforestation: Roots of trees bind the soil and reduce the impact of rain and wind on the soil surface.
3. Construction of stone walls / Check dams: These slow down the flow of water and prevent gully erosion on steep slopes.
4. Strip cropping: Strips of grass are left to grow between the crops to break the force of wind and water.

Given: Land use pattern in India and reasons for stagnant forest cover.

Land Use Pattern in India:

Land in India is used for various purposes. The total geographical area of India is 3.28 million sq. km, but land use data is available for only about 93% of it. The major categories of land use are:

• The net sown area is about 54% of the total reporting area.
• Forests cover about 23% of the total area, which is less than the desired 33% recommended for maintaining ecological balance.
• Fallow lands and culturable waste lands indicate the potential for future agricultural expansion.

Why has forest area not increased much since 1960–61?

The land under forest has not increased significantly since 1960–61 due to the following reasons:

1. Increasing population pressure has led to the conversion of forest land into agricultural land to meet the growing demand for food.
2. Developmental activities such as construction of dams, roads, industries, and urban expansion have encroached upon forest land.
3. Overgrazing and illegal felling of trees have degraded existing forests.
4. Demand for firewood and timber by local communities has led to deforestation.
5. Government policies have not been effectively implemented to protect and expand forest cover.

Thus, despite the constitutional directive to maintain 33% of land under forests, the actual forest cover remains far below this target.

Given: Relationship between technical and economic development and resource consumption.

Answer:

Technical and economic development have led to a massive increase in the consumption of resources in the following ways:

1. Industrialisation: With the growth of industries, the demand for raw materials such as minerals, coal, petroleum, and water has increased enormously. Machines and factories consume large quantities of energy and natural resources.

2. Modernisation of Agriculture: The use of chemical fertilisers, pesticides, modern machinery (tractors, harvesters), and irrigation systems has increased the consumption of land, water, and energy resources.

3. Urbanisation: Economic development has led to rapid urbanisation. Cities require large amounts of land, water, energy, and building materials, putting pressure on natural resources.

4. Improved Standard of Living: As incomes rise due to economic development, people consume more goods — automobiles, electronic appliances, packaged food — all of which require more resources to produce.

5. Transportation and Communication: Development of road, rail, air, and sea networks requires steel, petroleum, and other materials in large quantities.

6. Technological Advancements: New technologies have made it possible to exploit resources that were previously inaccessible (e.g., deep-sea mining, shale gas extraction), leading to greater extraction and consumption.

Conclusion: While technical and economic development has improved human welfare, it has also led to the over-exploitation of resources. This makes it essential to adopt sustainable development practices so that resources are available for future generations as well.

The hidden words in the puzzle are as follows:

(i) Natural endowments in the form of land, water, vegetation and minerals.
→ RESOURCES (found horizontally/vertically in the grid)

(ii) A type of non-renewable resource.
→ MINERALS (found horizontally in Row 6: M-I-N-E-R-A-L-S)

(iii) Soil with high water retaining capacity.
→ BLACK (Black soil has the highest water-retaining capacity; found vertically in the grid)

(iv) Intensively leached soils of the monsoon climate.
→ LATERITE (found horizontally in Row 8: L-A-T-E-R-I-T-E)

(v) Plantation of trees on a large scale to check soil erosion.
→ AFFORESTATION (found horizontally in Row 2: A-F-F-O-R-E-S-T-A-T-I-O-N)

(vi) The Great Plains of India are made up of these soils.
→ ALLUVIAL (found vertically/horizontally in the grid)

Summary Table: