Match List I with List II and select the correct answer using the code given below the Lists : List I List II (Drainage Pattern of River) (Feature) A. 1. B. 2. C. 3. D. 4.Insequent Whose direction of flow is controlled by the rock structure Consequent No apparent reason why it follows the path it takes Subsequent Flow in the same direction as the consequent stream but at a lower level Resequent Whose course is determined by the original slope of the land
Understanding River Drainage Patterns
River drainage patterns describe the network of streams and rivers in a particular drainage basin. These patterns are influenced by several factors, including the geology, topography, climate, and vegetation of the area. Matching different types of drainage patterns to their characteristic features helps us understand how rivers interact with the landscape.
Let's look at the given drainage patterns and their features:
List I | List II | ||
(Drainage Pattern of River) | (Feature) | ||
A. | Insequent | 1. | Whose direction of flow is controlled by the rock structure |
B. | Consequent | 2. | No apparent reason why it follows the path it takes |
C. | Subsequent | 3. | Flow in the same direction as the consequent stream but at a lower level |
D. | Resequent | 4. | Whose course is determined by the original slope of the land |
Now let's match each drainage pattern from List I with its correct feature from List II:
- Insequent Drainage Pattern: This type of pattern seems random or irregular. The streams do not appear to follow any specific structural control from the underlying rocks or original slope. Therefore, it matches with the feature "No apparent reason why it follows the path it takes."
- Consequent Drainage Pattern: These are the initial streams that develop on a newly exposed land surface. Their direction of flow is directly determined by the original gradient or slope of the land. This matches the feature "Whose course is determined by the original slope of the land."
- Subsequent Drainage Pattern: These streams develop later, often eroding along weaker rock layers (like shale) that are exposed after the initial consequent streams have cut down. Their direction is controlled by the underlying rock structure, typically perpendicular to the consequent streams. This matches the feature "Whose direction of flow is controlled by the rock structure."
- Resequent Drainage Pattern: These streams flow in the same direction as the original consequent streams but develop later and at a lower topographic level. They often flow down dip slopes (slopes parallel to rock layers). This matches the feature "Flow in the same direction as the consequent stream but at a lower level."
Based on these explanations, the correct matching is:
- A (Insequent) matches with 2 (No apparent reason...).
- B (Consequent) matches with 4 (Whose course is determined by the original slope...).
- C (Subsequent) matches with 1 (Whose direction of flow is controlled by the rock structure).
- D (Resequent) matches with 3 (Flow in the same direction as the consequent stream...).
This corresponds to the option: (A) - (2), (B) - (4), (C) - (1), (D) - (3).
Revision Table: Drainage Pattern Matching
| Drainage Pattern (List I) | Feature (List II) | Matching Number |
|---|---|---|
| Insequent | No apparent reason why it follows the path it takes | 2 |
| Consequent | Whose course is determined by the original slope of the land | 4 |
| Subsequent | Whose direction of flow is controlled by the rock structure | 1 |
| Resequent | Flow in the same direction as the consequent stream but at a lower level | 3 |
Additional Information on Drainage Patterns
Understanding different drainage patterns is key in geomorphology. Besides the types mentioned, other patterns exist:
- Dendritic: Tree-like pattern, forms on uniform rock structure with consistent resistance to erosion. It's the most common type.
- Trellis: Rectangular pattern, develops in areas with folded rock layers where subsequent streams flow along weaker rock and consequent streams cut across ridges.
- Radial: Streams flow outward from a central elevated point like a volcano or dome.
- Centripetal: Streams flow inward towards a central depression or basin.
- Annular: Ring-like pattern, develops around domes where streams erode along concentric layers of weak rock.
These patterns are a direct result of the interplay between geological structure, relief, and erosion over time.
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