Match the following columns and choose the correct option w.r.t. hydrarch succession.
a. submerged plant stage (column I) and (i) hydrilla (column II)
b. scrub stage (column I), (ii) phytoplanktons ( column II)
c. Pioneer community (column I), (iii) juncas(column II)
d. Marsh meadow stage (column I), (iv) Salix (column II)

Options

A. a(i), b(iv), c(ii), d(iii)
B. a(i), b(ii), c(iv), d(iii)
C. a(i), b(iii), c(iv), d(ii)
D. a(ii), b(iv), c(i), d(iii)

Answer

To solve the question of matching the columns with respect to hydrarch succession, we will analyze each stage of succession and its corresponding example.

### Step-by-Step Solution:

1. **Understanding Hydrarch Succession**:
- Hydrarch succession refers to the process of plant succession that begins in aquatic environments and progresses to terrestrial ecosystems. It starts in shallow water and eventually leads to the establishment of a forest.

2. **Identifying the Stages**:
- We have four stages to match:
- A. Submerged plant stage
- B. Scrub stage
- C. Pioneer community
- D. Marsh meadow stage

3. **Matching Each Stage with Examples**:
- **A. Submerged plant stage**: This stage is characterized by plants that grow entirely underwater. The example for this stage is **(i) Hydrilla**.
- **B. Scrub stage**: This stage consists of shrubs and small trees. The example for this stage is **(iv) Salix** (willow).
- **C. Pioneer community**: This is the first community to colonize a disturbed area, often consisting of simple organisms. The example for this stage is **(ii) Phytoplanktons**.
- **D. Marsh meadow stage**: This stage is characterized by wetland plants. The example for this stage is **(iii) Juncus** (a type of rush).

4. **Final Matching**:
- A (Submerged plant stage) - (i) Hydrilla
- B (Scrub stage) - (iv) Salix
- C (Pioneer community) - (ii) Phytoplanktons
- D (Marsh meadow stage) - (iii) Juncus

5. **Conclusion**:
- The correct matches are:
- A - (i)
- B - (iv)
- C - (ii)
- D - (iii)

### Final Answer:
The correct option is **Option 1**.