Q 1. Give reasons why following sentences are right or wrong:

(1) The main aim of distributional maps is to show location.

Ans: Wrong

Reason: The main aim of distributional maps is to show the distribution of variables like temperature, rainfall, population, etc.
(i) Distribution maps are types of thematic maps.
(ii) These maps are prepared with special themes, like the distribution of various variables in a particular region.
(iii) They make use of different methods to show the distribution of variables like temperature, rainfall, population, etc.
(iv) Thus, the main aim of distributional maps is to show the distribution of variables in a particular region.

(2) In choropleth maps, only one value is assigned to the sub-administrative unit. 

Ans: Right 

Reason:

(i) In choropleth maps, the data regarding various geographical variables is shown by shading or using tints of various colours.
(ii) After gathering the data for a selected variable, five to seven classes are made, considering the smallest and largest values.
(iii) Each class is assigned a tint of the same colour or black-and-white patterns.
(iv) A particular value shown by a predetermined tint of colour can represent only a particular region or group of regions.
(v) Thus, in choropleth maps, only one value is assigned to a sub-administrative unit.

(3) In choropleth maps, colours/tints do not change according to the values of the variables. 

Ans: Wrong. 

Reason: In choropleth maps, colors or tints change according to the values of variables.
(i) In choropleth maps, the smallest and largest values are taken into consideration, and after that, 5-7 classes are made.
(ii) Each class is assigned a unique tint of the same color or black and white pattern.
(iii) In other words, each class is used to show the distribution of a particular variable in a sub-administrative unit.

(4) Choropleth maps are used to show altitudes. 

Ans: Wrong.

Reason: Isopleth maps, not choropleth maps, are used to show altitude.

(i) When the distribution of a variable is continuous, like altitude, the isopleth method map is used.

(ii) Isopleth maps use lines joining the locations with equal values and are hence useful to show the change in altitude in the region.

(iii) When the distribution of a variable is discontinuous, the choropleth method map is used to show its distribution.

For example, distribution of population, domestic animals, etc.

(5) Isopleth maps are used to show population distribution. 

Ans: Wrong.

Reason: Dot method maps or choropleth method maps are used to show population distribution.
(i) The distribution of a population is discontinuous.
(ii) Isopleth method maps are used to show the distribution of continuous variables. For example, altitude, temperature, etc.
(iii) Thus, isopleth method maps are not used to show population distribution.

(6) In dot method, every dot should have an appropriate scale. 

Ans: Right.

Reason: The size of the dot is decided as per the value of a variable that is freely scattered across the region.

(7) Isopleth maps are not made using isolines.

Ans: Wrong.

Reason: Isopleth maps are made using isolines.
(i) Isolines are lines joining places with the same values of a given variable in a map.
(ii) Since isopleth maps are also prepared in the same way, we can say that they are made using isolines.

(8) Distribution of various geographical elements can be shown using the dot method.

Ans: Wrong.

Reason: The distribution of various geographical elements cannot be shown using the dot method.

(i) The distribution of geographical elements that are freely scattered across a region can be shown using the dot method.

(ii) The distribution of variables like population, minerals, cattle, etc. is freely scattered and hence can be shown on a dot method map.

(iii) Whereas the distribution of continuous variables like rainfall, altitude, temperature, etc. cannot be shown using a dot method map.