Q. Which of the following land features related to Karst topography is/are correctly matched?
Landform
Features
1. Uvalas
Narrow to wide trenches formed due to the joining of Sinkholes and Dolines.
2. Stalactites
Deposit of limestone rising upwards from the floor.
3. Stalagmites
Deposit of limestone growing downwards from the roof.
Select the correct answer using the code given below:
| Landform | Features |
| 1. Uvalas | Narrow to wide trenches formed due to the joining of Sinkholes and Dolines. |
| 2. Stalactites | Deposit of limestone rising upwards from the floor. |
| 3. Stalagmites | Deposit of limestone growing downwards from the roof. |
Select the correct answer using the code given below:
The correct option is B 1 only
Explanation:
Pair 1 is correctly matched: When Sinkholes and Dolines join together because of slumping of materials along their margins or due to roof collapse of the cave, long, narrow to wide trenches called valley sinks or Uvalas form.
Pair 2 is incorrectly matched: The water containing limestone in solution seeps through the roof in the form of a continuous chain of drops. A portion of the roof hangs on the roof and on evaporation of water, a small deposit of limestone is left behind contributing to the formation of a stalactite, growing downwards from the roof.
Pair 3 is incorrectly matched: The remaining portion of the drop falls to the floor. This also evaporates, leaving behind a small deposit of limestone aiding the formation of a stalagmite, thicker and flatter, rising upwards from the floor. Sometimes, stalactite and stalagmite join together to form a complete pillar known as the column.
Explanation:
Pair 1 is correctly matched: When Sinkholes and Dolines join together because of slumping of materials along their margins or due to roof collapse of the cave, long, narrow to wide trenches called valley sinks or Uvalas form.
Pair 2 is incorrectly matched: The water containing limestone in solution seeps through the roof in the form of a continuous chain of drops. A portion of the roof hangs on the roof and on evaporation of water, a small deposit of limestone is left behind contributing to the formation of a stalactite, growing downwards from the roof.
Pair 3 is incorrectly matched: The remaining portion of the drop falls to the floor. This also evaporates, leaving behind a small deposit of limestone aiding the formation of a stalagmite, thicker and flatter, rising upwards from the floor. Sometimes, stalactite and stalagmite join together to form a complete pillar known as the column.
