According To definition of Lichens: Lichens are symbiotic associations of a fungus with the photosynthetic partner called as phycobiont such as green algae or cyanobacteria.gain, The two organisms live in close association with each other and both get benefit from this kind of association, this is called Symbiotic Association. By the way, Parasitic relation means living in or on another organism (host) and causing harm to it.
The White Nile (Arabic: Ø§ÙÙÙÙ Ø§ÙØ£Ø¨ÙØ¶ââ an-nÄ«l al-'abyaá¸) is a river in Africa, one of the two main tributaries of the Nile; the other is the Blue Nile. In the strict meaning, White Nile refers to the river formed at Lake Victoria, at the confluence of the Bahr al Jabal and Bahr el Ghazal Rivers.
The origins of the White Nile are in deep central Africa, as far south as southern Rwanda. The river flows north through Tanzania, Lake Victoria, Uganda and into Southern Sudan. The Blue Nile flows about 1,400 km (850 miles) to Khartoum from Lake Tana 1,800 meters above sea level in the Ethiopian Mountains.he White and Blue Nile Rivers merge near the Sudanese capital of Khartoum, becoming the Nile proper which itself flows in two distinct parts. An 1336 km (830 mile) long stretch of the Nile flows through the desert allowing irrigation and agriculture in these areas.