Each of the provided statements is scientifically accurate according to biological classification:

Viruses are obligate parasites: They cannot replicate or carry out metabolic activities outside of a living host cell.

Algal component (Phycobiont): In the symbiotic relationship of lichens, the photosynthetic partner (alga or cyanobacterium) is specifically referred to as the phycobiont.

Fungal component (Mycobiont): The fungal partner that provides structure, shelter, and nutrient absorption in lichens is called the mycobiont.