Given below are some of the stages of the hydrarch.

(A) March-meadow stage
(B) Reed-swamp stage
(C ) submerged plant stage (D) Phyotplankton stage
Select the option that represents the correct sequence of these stages.

Options

A. `DrarrCrarrErarrBrarrA`
B. `CrarrErarrArarrBrarrD`
C. `BrarrDrarrCrarrArarrE`
D. `DrarrErarrCrarrBrarrA`

Answer

To determine the correct sequence of the stages in the hydrarch succession, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Stages**: The stages given are:
- (A) March-meadow stage
- (B) Reed-swamp stage
- (C) Submerged plant stage
- (D) Phytoplankton stage

2. **Understand Hydrarch Succession**: Hydrarch succession occurs in aquatic environments and progresses from hydric (wet) conditions to mesic (normal) conditions.

3. **Determine the First Stage**: The first stage in hydrarch succession is the **Phytoplankton stage (D)**. This is where the initial organisms, such as phytoplankton, begin to thrive in the water.

4. **Next Stage**: After the phytoplankton stage, the next stage is the **Submerged plant stage (C)**. In this stage, submerged plants start to grow as the water body becomes more stable.

5. **Following Stage**: The next stage is the **Reed-swamp stage (B)**. In this stage, emergent plants begin to dominate as the water level decreases and mud starts to accumulate.

6. **Final Stage**: The last stage in this sequence is the **March-meadow stage (A)**. This stage represents the transition to a more terrestrial environment as the area becomes marshy and eventually leads to dry land.

7. **Correct Sequence**: Therefore, the correct sequence of stages in hydrarch succession is:
- (D) Phytoplankton stage
- (C) Submerged plant stage
- (B) Reed-swamp stage
- (A) March-meadow stage

### Final Answer:
The correct sequence is: **(D) Phytoplankton stage → (C) Submerged plant stage → (B) Reed-swamp stage → (A) March-meadow stage**.