Correct Option (b):
An isopleth map uses isolines to connect points of equal value of a continuous variable across a geographic area. Examples include isobars (lines of equal atmospheric pressure), isotherms (lines of equal temperature), and isohyets (lines of equal rainfall). Daily weather maps utilize isobars to illustrate the distribution of atmospheric pressure, which is fundamental for identifying pressure systems, predicting wind patterns, and forecasting weather.
Incorrect Options:
A choropleth map represents statistical data by shading or coloring predefined administrative areas (e.g., districts, states) according to the value of the variable. It is used for aggregated data within areas, such as population density or literacy rates, not for continuous point data like atmospheric pressure.
A chorochromatic map depicts qualitative data using distinct colors to differentiate various categories or types of phenomena, such as land use, vegetation zones, or geological formations. It does not involve numerical gradation or continuous variables.
A choroschematic map employs symbols, diagrams, or simplified representations to illustrate geographical phenomena, often focusing on relationships or distributions rather than precise spatial details. It is not suitable for displaying continuous quantitative variables like those found in daily weather maps.