Tropical Evergreen Forests

The correct answer is option 'c': Tropical evergreen forest. Sundari is a well-known species found in the tropical evergreen forests.

Explanation:

Tropical evergreen forests, also known as tropical rainforests, are characterized by dense vegetation, high humidity, and heavy rainfall throughout the year. These forests are found in regions near the equator, such as the Amazon rainforest in South America and the Congo Basin in Africa.

Characteristics of Tropical Evergreen Forests:
- High biodiversity: These forests are home to a wide variety of plant and animal species. The dense canopy of trees provides a suitable habitat for numerous plants, birds, mammals, and insects.
- Dense vegetation: The trees in tropical evergreen forests have broad leaves and are closely spaced. This results in a thick canopy that blocks most of the sunlight from reaching the forest floor.
- High rainfall: These forests receive heavy rainfall throughout the year, which supports the growth of diverse plant species.
- Nutrient-rich soil: The constant decomposition of organic matter from fallen leaves and other plant materials enriches the soil with nutrients.
- Continuous growth and reproduction: Due to the favorable climatic conditions, plants in tropical evergreen forests have a continuous growth and reproduction cycle.

Sundari Tree:
- The Sundari tree (Heritiera fomes) is a species commonly found in the Sundarbans mangrove forest, located in the delta region of the Ganges, Brahmaputra, and Meghna rivers in Bangladesh and India.
- Sundari trees are well-adapted to the brackish water conditions of the mangrove ecosystem. They have stilt roots that help them anchor themselves in the muddy soil and withstand tidal movements.
- Sundari trees play a crucial role in the Sundarbans ecosystem. They provide habitat and nesting sites for various animals, including the Bengal tiger and the estuarine crocodile.
- The timber of the Sundari tree is highly valued for its durability and resistance to water, making it a valuable resource for local communities.
- Sundari trees also contribute to protecting the coastlines from erosion and reducing the impact of cyclones and tidal surges.

Therefore, the correct answer is option 'c': Tropical evergreen forest, as the Sundari tree is commonly found in the Sundarbans mangrove forest, which falls under the category of tropical evergreen forests.