Chapter 1 Important Questions: Introduction Why Social Science?

Social Science is mainly concerned with understanding human society — how it functions, its history, culture, governance, and economy — in order to help build a better future.

(b) Biology. Biology is a natural science, not a subdiscipline of Social Science. Geography, Economics, and Archaeology are all subdisciplines of Social Science.

The Equator's latitude value is 0° (zero degrees). It is the reference line from which all other latitudes are measured.

The Prime Meridian is the meridian at 0° longitude. It passes through Greenwich, an area of London in England, and was internationally standardised in the year 1884.

Indian Standard Time (IST) is 5 hours and 30 minutes (5.5 hours) ahead of Greenwich Mean Time (GMT).

(b) An imaginary line running east-west, parallel to the Equator. A parallel of latitude is an imaginary line that runs east and west around the Earth, parallel to the Equator, marking a specific degree of latitude.

The five broad themes are:

1. Theme A – India and the World: Land and the People: Covers geographical basics of the planet, maps, and how geography shaped civilisations.

2. Theme B – Tapestry of the Past: Focuses on history, especially India's past, to understand the present and avoid repeating past mistakes.

3. Theme C – Our Cultural Heritage and Knowledge Traditions: Explores India's rich and ancient culture, its guiding principles and how it can address modern issues.

4. Theme D – Governance and Democracy: Studies India's political system, citizens' rights and duties, and how governance works at different levels.

5. Theme E – Economic Life Around Us: Examines how an economy works, what money is, and how natural and human resources are managed.

The three important components of a map are:

1. Distance (Scale): Scale tells us the relationship between the distance on the map and the actual distance on the ground. For example, 1 cm on the map may represent 500 metres on the ground.

2. Direction: Maps use cardinal directions — North, South, East, and West — along with intermediate directions like Northeast, Southeast, Southwest, and Northwest, usually indicated by an arrow marked 'N' for north.

3. Symbols: Symbols are small drawings or signs used to represent features like buildings, roads, rivers, and forests on the map. Different countries use different sets of symbols; in India, the Survey of India has fixed a set of standard symbols.

Latitude is a measure of the distance of any place from the Equator, expressed in degrees. The Equator is at 0° latitude, the North Pole is at 90°N, and the South Pole is at 90°S. Parallels of latitude are imaginary lines drawn east-west parallel to the Equator, forming circles around the Earth. These circles grow smaller as we move towards the poles.

Latitude and climate are closely connected:

• Around the Equator (low latitudes), the climate is generally hot or 'torrid'.

• As latitude increases (moving away from the Equator), the climate becomes more moderate or 'temperate'.

• Near the poles (high latitudes), the climate is very cold or 'frigid'.

This variation in climate with latitude is caused by the angle at which sunlight strikes the Earth's surface.

The International Date Line is an imaginary line located approximately at 180° longitude, opposite the Prime Meridian (Greenwich Meridian). It is the line where one calendar day ends and another begins.

• When you cross the International Date Line travelling eastward, you subtract one day (for example, from Monday to Sunday).

• When you cross it travelling westward, you add one day (for example, from Sunday to Monday).

The International Date Line is not perfectly straight — it deviates in certain places to avoid dividing some countries into two different calendar days. The +12 and –12 time zones meet at this line.

The ancient Indian prime meridian was called madhya rekhā, which means 'middle line'. It passed through the city of Ujjayinī, known today as Ujjain, which was a renowned centre for astronomy over many centuries. Indian astronomers were well aware of the concepts of latitude and longitude, including the need for a zero or prime meridian, long before the Greenwich Meridian was internationally adopted in 1884. One famous astronomer associated with Ujjayinī was Varāhamihira, who lived and worked there approximately 1,500 years ago. The Ujjayinī meridian served as the reference for astronomical calculations in all ancient Indian astronomical texts.

The Earth rotates 360° in 24 hours, which means it rotates 15° per hour.

(a) Delhi at 77°E:

77° ÷ 15 = approximately 5.13 hours ≈ 5 hours 8 minutes ahead of GMT.

So local time at Delhi ≈ 12:00 noon + 5 hours 8 minutes = 5:08 PM.

(Note: India's standard IST is 5 hours 30 minutes ahead of GMT, which is based on 82.5°E.)

(b) New York at 74°W:

74° ÷ 15 = approximately 4.93 hours ≈ 4 hours 56 minutes behind GMT.

So local time at New York ≈ 12:00 noon – 4 hours 56 minutes = 7:04 AM.

Thus, when it is noon in Greenwich, it is approximately 5 PM in Delhi and approximately 7 AM in New York.

Social Science is extremely important for students in the 21st century for the following reasons:

1. Understanding a Complex World: The 21st century is a time of both great possibilities and great challenges. There is rapid progress in technology that is changing lives, but at the same time the world is witnessing multiple wars, armed conflicts, rising social tensions, and severe stress on the natural environment. To navigate this complex world, we need to understand human societies deeply, which is precisely what Social Science offers.

2. Finding Solutions to Human Problems: Questions like 'How do we solve problems facing humanity?', 'How can societies live in peace and harmony?', and 'How can we protect the Earth for future generations and other species?' cannot be answered without a thorough understanding of human societies, history, governance, and economics — all of which are part of Social Science.

3. Understanding Diversity and Complexity: Human societies are very diverse and complex. Social Science provides the tools and methods to understand this diversity and complexity, helping us appreciate different cultures, histories, and ways of life.

4. Becoming Responsible Citizens: Social Science teaches students about governance, democracy, rights, duties, and economic activities, enabling them to become informed and responsible citizens who can participate meaningfully in society.

5. Connecting Past, Present, and Future: Social Science uses the past as a key to understanding the present and preparing for a better future. It helps students learn from historical mistakes and appreciate their cultural roots.

6. Developing Critical Thinking: Social Science teaches the art of asking the right questions, which is essential for critical thinking and problem-solving in everyday life.

In short, Social Science is not just an academic subject — it is an exploration and an adventure that equips students with the knowledge and skills to understand the world and contribute positively to it.

The system of latitudes and longitudes works as a coordinate system — similar to how rows and columns are used on a chessboard or in a market — to precisely locate any place on Earth.

1. Latitudes:

Latitude measures the angular distance of a place from the Equator. The Equator is at 0°, the North Pole at 90°N, and the South Pole at 90°S. Parallels of latitude are imaginary lines running east-west, parallel to the Equator. They form circles that decrease in size as we move towards the poles.

2. Longitudes:

Longitude measures the angular distance of a place from the Prime Meridian (0° longitude, passing through Greenwich, London). Meridians of longitude are imaginary half-circles running from the North Pole to the South Pole. Longitude is measured from 0° to 180° both eastward (E) and westward (W) from the Prime Meridian.

3. Together as Coordinates:

Just as two coordinates (a letter and a number) are needed to locate a square on a chessboard, both latitude and longitude together are needed to pinpoint any location on Earth. For example:

• Delhi lies at approximately 29°N latitude and 77°E longitude.

• New York lies at approximately 41°N latitude and 74°W longitude.

• Tokyo lies at approximately 36°N latitude and 140°E longitude.

4. Grid Lines:

All parallels of latitude and meridians of longitude together form a grid on the globe, called grid lines, which make it easy to locate any place precisely.

5. Additional Use of Longitude — Time:

Longitude also helps determine local time. Since the Earth completes 360° in 24 hours, it rotates 15° per hour. Moving eastward from the Prime Meridian, local time increases by one hour for every 15° of longitude, and decreases moving westward. This is the basis for the world's time zones and standard times like Indian Standard Time (IST), which is 5 hours 30 minutes ahead of GMT.

Thus, the latitude-longitude coordinate system is an essential and precise tool for geography, navigation, and timekeeping.

Types of Maps:

Maps are representations or drawings of an area viewed from the top. There are several types:

1. Physical Maps: These mainly show natural features such as mountains, rivers, oceans, plains, and other landforms. They give information about the physical geography of an area.

2. Political Maps: These show details of countries or states, including boundaries, cities, capitals, and other human-made divisions. An example is a map of India showing all its States, Union Territories, and their capitals.

3. Thematic Maps: These convey specific kinds of information, such as population distribution, rainfall patterns, agricultural zones, or mineral resources.

An atlas is a book or collection of maps.

Why a Globe is Better than a Flat Map:

The Earth is not a flat surface — it is nearly spherical (slightly flattened at the poles). Because a globe shares the same spherical shape as the Earth, it represents the Earth's geography more accurately than a flat map.

A flat map distorts the shape, size, distance, or direction of landmasses and oceans. This is because it is mathematically impossible to represent a sphere accurately on a flat sheet of paper without distortion.

Example: If you peel an orange and try to flatten its skin on a table, you will find that you cannot do it without tearing the skin at the edges. Similarly, 'flattening' the Earth's surface onto a sheet of paper causes distortions. A globe avoids this problem by maintaining the spherical shape.

However, flat maps remain very useful for practical purposes — they are easier to carry, print, and use for navigation. Both maps and globes have their own advantages and are used for different purposes.