Match the columns and find out the correct combination :
`{:(A.,"Stable population",1.,"Triangular"),(B.,"Declining population",2.,"Urn shaped"),(C.,"Growing population",3.,"Bell shaped"),(D.,"Migration",4.,"Inward & outward movement"):}`

Options

A. A - 3, B - 2, C - 1, D - 4
B. A - 3, B - 2, C - 4, D - 1
C. A - 3, B - 1, C - 2, D - 4
D. A - 2, B - 3, C - 1, D - 4

Answer

To solve the problem of matching the columns, we will analyze each item in Column 1 and find the corresponding item in Column 2 based on the characteristics of population types and shapes of age pyramids.

### Step-by-Step Solution:

1. **Identify the characteristics of a Stable Population (A)**:
- A stable population has a balanced number of individuals in all age groups, meaning the number of pre-reproductive individuals is approximately equal to the reproductive individuals.
- The age pyramid for a stable population resembles a **bell shape**.

**Match**: A → 3 (Bell shaped)

2. **Identify the characteristics of a Declining Population (B)**:
- In a declining population, there are fewer pre-reproductive individuals compared to reproductive individuals, indicating a decrease in population size.
- The age pyramid for a declining population takes the shape of an **urn** (wider at the top and narrower at the bottom).

**Match**: B → 2 (Urn shaped)

3. **Identify the characteristics of a Growing Population (C)**:
- A growing population has a higher number of pre-reproductive individuals compared to reproductive individuals, indicating an increase in population size.
- The age pyramid for a growing population is typically **triangular**.

**Match**: C → 1 (Triangular)

4. **Identify the characteristics of Migration (D)**:
- Migration refers to the movement of individuals into (immigration) or out of (emigration) a population.
- This concept is best described as **inward and outward movement**.

**Match**: D → 4 (Inward & outward movement)

### Final Matches:
- A → 3 (Stable population → Bell shaped)
- B → 2 (Declining population → Urn shaped)
- C → 1 (Growing population → Triangular)
- D → 4 (Migration → Inward & outward movement)

### Final Answer:
- A - 3
- B - 2
- C - 1
- D - 4

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