Maximum producer in per unit area found in Forest Ecosystem.

Forest Ecosystem
- A forest ecosystem is a complex community of plants, animals, microorganisms, and inorganic matter that interact with each other within a forested area.
- Forests are one of the most productive ecosystems on earth, producing large amounts of biomass and oxygen through the process of photosynthesis.
- The forest ecosystem is characterized by a high density of producers or photosynthetic organisms, such as trees, shrubs, and other vegetation.

Maximum Producer
- Producers are the organisms in an ecosystem that convert solar energy into chemical energy through photosynthesis.
- In a forest ecosystem, trees are the primary producers and are responsible for producing the majority of the biomass and oxygen.
- Trees are tall and have large surface areas for photosynthesis, allowing them to capture a large amount of solar energy per unit area.

Factors Contributing to Maximum Producer
- The high productivity of forest ecosystems is due to several factors, including a favorable climate, abundant rainfall, and a nutrient-rich soil.
- The diverse range of plant species in a forest ecosystem allows for a variety of photosynthetic pathways and nutrient acquisition strategies, increasing the overall productivity of the ecosystem.
- The complex food webs and nutrient cycling processes that occur within a forest ecosystem also contribute to its high productivity.

Conclusion
In summary, the forest ecosystem is characterized by a high density of producers and is one of the most productive ecosystems on earth. The favorable climate, abundant rainfall, nutrient-rich soil, diverse range of plant species, and complex food webs and nutrient cycling processes all contribute to the high productivity of the forest ecosystem.

in per unit area max productivity is found in tropical rain forest. so ans should be 3rd option.