Explain why lichen symbiotic associated between a sac fungus and a photosynthetic green algae or cyanobacteria

Answer 1

Lichen is a unique organism that is a symbiotic association between a sac fungus (usually from the Ascomycota division) and a photosynthetic partner, either a green algae or a cyanobacterium. The sac fungus provides a stable physical structure for the lichen and helps with the absorption of nutrients, while the photosynthetic partner produces carbohydrates through photosynthesis, which can be used by both organisms.

This symbiotic relationship is beneficial for both partners. The fungus provides protection and nutrients for the photosynthetic partner, as well as a stable environment for growth. In return, the photosynthetic partner provides the fungus with carbohydrates that it produces through photosynthesis, which the fungus would not be able to produce on its own.

Furthermore, the photosynthetic partner also helps to increase the overall productivity of the lichen, as it can use sunlight to produce energy and nutrients that the fungus and the lichen as a whole can utilize. This allows lichens to thrive in a variety of environments, including harsh conditions such as deserts, tundras, and rocky surfaces.

Overall, the symbiotic relationship between a sac fungus and a photosynthetic partner in lichen allows both organisms to survive and thrive in a wide range of habitats, making lichens an important and successful group of organisms in the natural world.