Question

With respect to the symbols and drawing patterns that are used to represent important drainage features in topographical maps, consider the following statements:

$\begin{array}{cc}1.& \text{Rivers and streams are usually represented by linear lines.}\\ 2.& \text{If drawn in blue, it means these are perennial rivers}\\ & \text{or streams, which have water throughout the year.}\\ 3.& \text{If drawn in black, it means they are non-perennial}\\ & \text{or seasonal in nature.}\end{array}$

Select the correct answer using the code given below:

• A. 1 and 2
• B. 2 and 3
• C. 1 and 2
• D. 1, 2, and 3

Answer 1

The correct option is D 1, 2, and 3

Representing drainage features like rivers, streams, canals, and other flowing water bodies is an important aspect of a topographical map. The drainage system of an area tells us a lot about the topography of the area, and it also affects the activities of the people residing there.

Hence,
1. Rivers and streams are usually represented by linear lines. But, some lines are blue and some are black.
2. If drawn in blue, it means the system has water throughout the year. These are called perennial rivers or streams.
3. Black means they are non-perennial or seasonal in nature.