Question 1

Choose the right answer from the four alternatives given below:

(i) Which one of the following map shows the population distribution:

(a) Choropleth maps

(b) Isopleth maps

(c) Dot maps

(d) Square root maps

(ii) Which one of the following is best suited to represent the decadal growth of population?

(a) Line graph

(b) Bar diagram

(c) Circle diagram

(d) Flow diagram

(iii) Polygraph is constructed to represent:

(a) Only one variable

(b) Two variables only

(c) More than two variables

(d) None of the above

(iv) Which one of the following maps is known as "Dynamic Map"?

(a) Dot map

(b) Choropleth

(c) Isopleth

(d) Flow map

Accepted Answer

(i) (c) Dot maps show population distribution by placing dots representing population units.

(ii) (a) Line graph is best suited to represent decadal growth of population as it shows trends over time.

(iii) (c) Polygraph is constructed to represent more than two variables simultaneously.

(iv) (d) Flow map is known as "Dynamic Map" because it shows movement or flow of phenomena. — Step-by-step explanation:
(i) Dot maps use dots to show exact locations and density of population, making them ideal for population distribution.
(ii) Line graphs effectively show changes over time, such as decadal growth.
(iii) Polygraphs combine multiple variables into one graph for comparative analysis.
(iv) Flow maps depict movement (e.g., migration, traffic), hence called dynamic.

Question 2

Answer the following questions in about 30 words:

(i) What is a thematic map?
(ii) Differentiate between multiple bar diagram and compound bar diagram.
(iii) What are the requirements to construct a dot map?
(iv) Describe the method of constructing a traffic flow map.
(v) What is an Isopleth map? How an interpolation is carried out?
(vi) Describe and illustrate important steps to be followed in preparing a choropleth map.
(vii) Discuss important steps to represent data with help of a pie-diagram.

Accepted Answer

(i) A thematic map is a map that focuses on a particular theme or subject area, such as population, rainfall, or land use.

(ii) Multiple bar diagram shows bars for different categories side by side for comparison; compound bar diagram stacks bars to show total and sub-parts.

(iii) Requirements for dot map: accurate data, suitable scale, and a dot value representing a fixed quantity.

(iv) Traffic flow map is constructed by representing flows with arrows of varying thickness proportional to volume, showing direction and magnitude.

(v) Isopleth map shows continuous data using lines of equal value; interpolation is done by estimating values between known points.

(vi) Steps for choropleth map: classify data into classes, select shading or color scheme, draw boundaries, and shade areas accordingly.

(vii) Steps for pie diagram: calculate percentage of each category, convert to angles, draw circle, and represent sectors proportionally with labels. — Each answer is concise and covers the key points:
(i) Defines thematic map.
(ii) Explains difference between two bar diagrams.
(iii) Lists requirements for dot map.
(iv) Describes construction of traffic flow map.
(v) Defines isopleth map and interpolation.
(vi) Details steps for choropleth map.
(vii) Explains pie diagram construction steps.

Question 3

# Activity

1. Represent the following data with the help of suitable diagram.

India : Trends of Urbanisation 1901-2001

|  Year | Decennial growth (%)  |
| --- | --- |
|  1911 | 0.35  |
|  1921 | 8.27  |
|  1931 | 19.12  |
|  1941 | 31.97  |
|  1951 | 41.42  |
|  1961 | 26.41  |
|  1971 | 38.23  |
|  1981 | 46.14  |
|  1991 | 36.47  |
|  2001 | 31.13  |

Accepted Answer

The data represents decennial growth of urbanisation in India from 1911 to 2001. The best suitable diagram to represent this data is a line graph or bar diagram showing growth percentage on Y-axis and years on X-axis.

Steps to represent:
1. Draw X-axis representing years from 1911 to 2001.
2. Draw Y-axis representing decennial growth percentage.
3. Plot points for each year against growth percentage.
4. Join points with lines (line graph) or draw bars for each year (bar diagram).

This visual representation helps in understanding trends and fluctuations in urbanisation over the century. — Line graph or bar diagram effectively shows changes over time. Plotting the data points and connecting them reveals trends clearly.

Question 4

Represent the following data with the help of suitable diagram.

India : Literacy and Enrolment Ratio in Primary and Upper Primary Schools

|  Year | Literacy Ratio |   |   | Enrolment Ratio Primary |   |   | Enrolment Ratio Upper Primary  |   |   |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|   | Person | Male | Female | Boys | Girls | Total | Boys | Girls | Total  |
|  1950-51 | 18.3 | 27.2 | 8.86 | 60.6 | 25 | 42.6 | 20.6 | 4.6 | 12.7  |
|  1999-2000 | 65.4 | 75.8 | 54.2 | 104 | 85 | 94.9 | 67.2 | 50 | 58.8  |

Accepted Answer

The data shows literacy ratios and enrolment ratios in primary and upper primary schools for two years, 1950-51 and 1999-2000.

Suitable diagrams include multiple bar diagrams or compound bar diagrams to compare literacy and enrolment ratios across years and categories (person, male, female, boys, girls, total).

Steps:
1. Select categories for X-axis (e.g., literacy person, male, female; enrolment boys, girls, total).
2. Y-axis represents percentage ratios.
3. Draw bars side by side for 1950-51 and 1999-2000 for each category.
4. Use different colors or patterns to distinguish years.

This representation helps compare progress in literacy and enrolment over time. — Multiple or compound bar diagrams allow comparison of multiple related data sets across years and categories clearly.

Question 5

Represent the following data with help of pie-diagram.

India : Land use 1951-2001

|   | 1950-51 | 1998-2001  |
| --- | --- | --- |
|  Net Sown Area | 42 | 46  |
|  Forest | 14 | 22  |
|  Not available for cultivation | 17 | 14  |
|  Fallow Land | 10 | 8  |
|  Pasture and Tree | 9 | 5  |
|  Cultruble Waste Land | 8 | 5  |

Accepted Answer

The data shows land use percentages for two periods: 1950-51 and 1998-2001.

To represent this data using pie diagrams:
1. Calculate total land use as 100% for each period.
2. For each category, calculate the angle for the pie sector: (percentage × 360) / 100.
3. Draw two separate pie charts, one for 1950-51 and one for 1998-2001.
4. Mark each sector with appropriate labels and colors.

This visual comparison shows changes in land use patterns over time. — Pie diagrams effectively show proportionate data and allow easy comparison between two time periods.

Question 6

Study the table given below and draw the given diagrams/maps.

Area and Production of Rice in major States

|  States | Area in 000 ha | % to total area | Production 000 tones | % to total production  |
| --- | --- | --- | --- | --- |
|  West Bengal | 5,435 | 12.3 | 12,428 | 14.6  |
|  Uttar Pradesh | 5,839 | 13.2 | 11,540 | 13.6  |
|  Andhra Pradesh | 4,028 | 9.1 | 12,428 | 13.5  |
|  Punjab | 2,611 | 5.9 | 9,154 | 10.8  |
|  Tamil Nadu | 2,113 | 4.8 | 7,218 | 8.5  |
|  Bihar | 3,671 | 8.3 | 5,417 | 6.4  |

(a) Construct a multiple bar diagram to show area under rice in each State.
(b) Construct a pie-diagram to show the percentage of area under rice in each State.
(c) Construct a dot map to show the production of rice in each State.
(d) Construct a Choropleth map to show the percentage of production of rice in States.

Accepted Answer

(a) Multiple bar diagram:
- X-axis: States
- Y-axis: Area in 000 ha
- Draw bars for each state representing area under rice.

(b) Pie diagram:
- Calculate percentage area under rice for each state.
- Draw pie chart with sectors proportional to these percentages.

(c) Dot map:
- Assign a dot value (e.g., 1000 tonnes per dot).
- Place dots on map of India in respective states proportional to production.

(d) Choropleth map:
- Classify states by percentage of rice production.
- Shade states with different colors or patterns according to production percentage classes.

These diagrams/maps visually represent rice area and production distribution across states. — Each representation uses appropriate graphical methods:
- Multiple bar for comparing areas.
- Pie for percentage distribution.
- Dot map for spatial production quantity.
- Choropleth for production percentage intensity.

Question 7

Show the following data of temperature and rainfall of Kolkata with a suitable diagram.

|  Months | Temperature in °C | Rainfall in cm  |
| --- | --- | --- |
|  Jan. | 19.6 | 1.2  |
|  Feb. | 22.0 | 2.8  |
|  Mar. | 27.1 | 3.4  |
|  Apr. | 30.1 | 5.1  |
|  May | 30.4 | 13.4  |
|  June | 29.9 | 29.0  |
|  Jul. | 28.9 | 33.1  |
|  Aug. | 28.7 | 33.4  |
|  Sep. | 28.9 | 25.3  |
|  Oct. | 27.6 | 12.7  |
|  Nov. | 23.4 | 2.7  |
|  Dec. | 19.7 | 0.4  |

Accepted Answer

The data shows monthly temperature and rainfall for Kolkata.

Suitable diagram: Climograph (combined line and bar graph).

Steps:
1. Draw X-axis for months.
2. Draw primary Y-axis for temperature (°C) and secondary Y-axis for rainfall (cm).
3. Plot temperature values as a line graph.
4. Plot rainfall values as bars.

This combined graph shows the relationship between temperature and rainfall throughout the year. — Climograph effectively displays two related variables over time, making it easy to analyze climate patterns.

Question 8

What is meant by the 'representation of data' in geography, and why is it important for understanding geographical phenomena?

Accepted Answer

Representation of data is the transformation of raw data into visual forms such as graphs, diagrams, maps, and charts. It is important because it simplifies complex data, facilitates understanding of patterns like population growth and distribution, and makes comparisons easier, leaving a lasting imprint on the mind. — Representation of data refers to converting collected data into visual forms like graphs and maps. This process helps in understanding complex geographical phenomena such as population distribution and growth by making the data easier to interpret and compare visually, which is more effective than tabular or descriptive formats.

Question 9

Which of the following graphical methods is most suitable for representing the growth of population over different years?

Accepted Answer

Line graph — Line graphs are ideal for representing time series data such as population growth over different years because they show trends and changes clearly over time. Pie diagrams represent parts of a whole, dot maps show spatial distribution, and flow maps depict movement between places.

Question 10

In graphical representation, why is the selection of a suitable scale important when drawing diagrams or maps?

Accepted Answer

The selection of a suitable scale is important because it ensures that the data is represented accurately and clearly. A scale that is too large or too small can distort the data or make it difficult to interpret. The scale must cover the entire range of data to provide a meaningful visual representation. — Choosing an appropriate scale is crucial to represent all data points properly without distortion. It helps maintain proportionality and clarity in diagrams or maps, allowing viewers to understand the data range and make accurate comparisons.

Question 11

Identify the correct components that must be included in the design of a map or diagram.

Accepted Answer

Title, Legend, Direction — The essential components of a map or diagram design include the Title (area name, data year, caption), Legend (explains symbols and colours), and Direction (usually the North symbol) to orient the map correctly. Tables and graphs are not part of the design components of a map/diagram.

Question 12

Explain the step-by-step process for constructing a line graph using time series data.

Accepted Answer

(a) Simplify the data by rounding values for clarity.
(b) Draw the X-axis (time variable such as years or months) and Y-axis (data quantity such as population growth rate).
(c) Select and mark a suitable scale on the Y-axis, including negative values if any.
(d) Plot data points on the graph according to the scale.
(e) Mark each data point with a dot.
(f) Join the dots with a freehand line to show the trend over time.
This method helps visualize changes and trends in the data clearly. — Constructing a line graph involves simplifying data for clarity, drawing X and Y axes with appropriate labels, selecting a suitable scale on Y-axis, plotting data points accurately, marking points with dots, and connecting them with a freehand line. This process visually represents trends over time such as population growth or temperature changes.

Question 13

Given the following data on population growth rates in India from 1901 to 2011, plot a line graph to represent the changes. What trend can you observe about the population growth rate over this period?

| Year | Growth Rate (%) |
|------|----------------|
| 1911 | 0.56           |
| 1921 | -0.30          |
| 1931 | 1.04           |
| 1941 | 1.33           |
| 1951 | 1.25           |
| 1961 | 1.96           |
| 1971 | 2.20           |
| 1981 | 2.22           |
| 1991 | 2.14           |
| 2001 | 1.93           |
| 2011 | 1.79           |

Accepted Answer

The line graph shows that the population growth rate was low and even negative in 1921, likely due to historical events. From 1931 onwards, the growth rate generally increased, peaking around 1981, and then gradually declined towards 2011. This indicates a rise and then a slow decrease in growth rate over the century. — Plotting the data points on a graph will show a dip in 1921, followed by a steady increase until the early 1980s, and a gradual decline thereafter. The negative growth in 1921 corresponds to historical factors like famines or epidemics. The trend reflects demographic transitions over time.

Question 14

What is a polygraph in the context of graphical data representation, and how does it differ from a simple line graph?

Accepted Answer

A polygraph is a line graph that shows two or more variables simultaneously using multiple lines with different patterns or colours. Unlike a simple line graph which shows only one variable over time, a polygraph allows immediate comparison of multiple variables, such as birth rate and death rate. — Polygraphs use multiple lines, each representing a different variable, to compare trends side by side on the same graph. This helps in analyzing relationships between variables over the same time period, unlike simple line graphs which focus on a single data set.

Question 15

Which of the following is NOT a correct rule for constructing a bar diagram?

Accepted Answer

Bars can have varying widths to show data importance — In bar diagrams, all bars must have equal width to maintain consistency and avoid misinterpretation. Varying widths can confuse the viewer about the quantity represented. Equal intervals and shading are correct rules.

conditions, distribution of rocks and minerals, soils, population, industries

conditions, distribution of rocks and minerals, soils, population, industries — Study Notes

Graphical Representation of Data

Representation of Data

General Rules for Drawing Graphs, Diagrams and Maps

Practice Questions — conditions, distribution of rocks and minerals, soils, population, industries

All 4 Chapters in Practical Work in Geography Part II