Mathc column I with column II and select the correct option from the given codes.
`{:("column I","Column II"),("Presence of 3-4 storeyed",(i)"Blue green angle"),("A biome having grasses with scattered trees",(ii)"Stratification"),("Man made ecosystem",(iii)"Savannah"),("Pioneer in hydrosere",(iv)"Dam"):}`

Options

A. ii,iii,iv,i
B. ii,iii,I,iv
C. I,iii,iv,ii
D. iii,iv,ii,i

Answer

To solve the matching question, we will analyze each item in Column I and find the corresponding item in Column II.

### Step-by-Step Solution:

1. **Presence of 3-4 storeyed**:
- This refers to the vertical layering of vegetation in an ecosystem. The correct term for this is **Stratification**.
- **Match**: Presence of 3-4 storeyed → (ii) Stratification

2. **A biome having grasses with scattered trees**:
- This description fits the **Savannah**, which is characterized by grasslands with occasional trees.
- **Match**: A biome having grasses with scattered trees → (iii) Savannah

3. **Man made ecosystem**:
- A **Dam** is an example of a man-made ecosystem, as it is constructed by humans to manage water resources.
- **Match**: Man made ecosystem → (iv) Dam

4. **Pioneer in hydrosere**:
- The pioneers in a hydrosere (a type of ecological succession that occurs in aquatic environments) are typically **Blue-green algae** (also known as cyanobacteria).
- **Match**: Pioneer in hydrosere → (i) Blue-green algae

### Final Matches:
- Presence of 3-4 storeyed → (ii) Stratification
- A biome having grasses with scattered trees → (iii) Savannah
- Man made ecosystem → (iv) Dam
- Pioneer in hydrosere → (i) Blue-green algae

### Correct Option:
Based on the matches, the correct option is:
1. (ii) Stratification
2. (iii) Savannah
3. (iv) Dam
4. (i) Blue-green algae