Which of the following is used to represent the geographical data on chorochromatic maps?

Correct option is A

The correct answer is: (a), Colours
Chorochromatic maps, also known as choropleth maps, are thematic maps that represent geographical data using different shades or colours to indicate variations in the data across different geographic areas.
The choice of colours on chorochromatic maps is crucial as it allows for the visual representation of quantitative data. Typically, darker or more intense colours represent higher values of the data variable being mapped, while lighter or less intense colours represent lower values. By using a gradient of colours, chorochromatic maps provide a visual interpretation of spatial patterns and variations in the data.
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Lines are typically used to represent geographical features such as rivers, roads, political boundaries, and contours on maps. They are not commonly used to represent quantitative data on chorochromatic maps. Instead, lines are used to convey linear features and spatial relationships between different geographic entities.
Points are used to represent discrete locations or features on maps, such as cities, landmarks, or specific geographic phenomena. While points can be associated with qualitative or quantitative attributes, they are not typically used to represent continuous, spatially distributed data on chorochromatic maps. Instead, points are used to denote specific locations of interest within the geographic context.
Pictures or symbols may be used on thematic maps to represent specific features or phenomena, especially when the data being represented are categorical or discrete in nature. However, pictures are not commonly used to represent quantitative data on chorochromatic maps. Instead, pictures or symbols are used to convey qualitative information or to denote specific types of features on maps.