**Ecological Succession on Bare Land: Increasing Wetness**

Ecological succession refers to the gradual change and development of an ecosystem over time. It occurs on bare land, where there is no existing vegetation or soil. The process of ecological succession involves the colonization of pioneer species, which are the first organisms to inhabit the area, and the subsequent establishment of more complex and diverse plant and animal communities.

**Primary Succession**

Primary succession occurs on bare land that has never been previously inhabited by living organisms. It typically begins with the colonization of pioneer species such as lichens and mosses, which are well-adapted to harsh environmental conditions and can grow on bare rock surfaces. These pioneer species are able to survive in the absence of soil because they have the ability to fix nitrogen and other essential nutrients from the atmosphere.

**Soil Formation and Moisture Retention**

As the pioneer species grow and die, they contribute organic matter to the bare land, which gradually leads to the development of soil. This process, known as soil formation or pedogenesis, is essential for the establishment of larger plants. The accumulation of organic matter creates a layer of topsoil that is able to retain moisture more effectively than bare rock surfaces.

**Succession and Wetness**

As the process of ecological succession continues, larger plants such as shrubs and trees begin to establish in the area. These plants have deeper roots that penetrate the soil, allowing them to access water resources that were previously unavailable. Additionally, the growth of vegetation leads to increased shade, which helps to reduce evaporation and maintain moisture levels in the ecosystem.

Over time, as the vegetation continues to develop and the soil becomes more enriched with organic matter, the overall wetness of the ecosystem increases. The establishment of a diverse plant community with a variety of root depths and water requirements further contributes to the retention of moisture in the area.

**Conclusion**

The correct answer to the question is option 'B': Increasing wetness. Ecological succession on bare land proceeds towards increasing wetness as the colonization of pioneer species, soil formation, and the establishment of a diverse plant community contribute to the retention of moisture in the ecosystem.