Concept:
Human settlements are classified on the basis of spacing, arrangement, and distribution of houses. The major rural settlement patterns are:
- Clustered or compact settlements
- Semi-clustered settlements
- Hamleted settlements
- Dispersed or isolated settlements
Each type develops according to physical, social, and economic conditions.
Step 1: Examine Statement 1.
Clustered settlements are commonly found in fertile alluvial plains because flat land and fertile soil support agriculture and dense population. Such settlements are also found in some northeastern regions.
Hence, Statement 1 is correct.
Step 2: Examine Statement 2.
Semi-clustered settlements often develop when a large compact village gets fragmented due to social segregation or expansion of population.
Hence, Statement 2 is correct.
Step 3: Examine Statement 3.
Hamleted settlements consist of small clusters of houses separated from each other. These are locally known by names such as:
- Panna
- Para
- Palli
- Nagla
- Dhani
Hence, Statement 3 is correct.
Step 4: Examine Statement 4.
Dispersed settlements are isolated settlements generally found in remote forests, hills, or sparsely populated regions where houses are scattered far apart.
Hence, Statement 4 is correct.
Therefore, all four statements are correct.
\[
\boxed{\text{Statements 1, 2, 3 and 4 are correct.}}
\]