1 Some DMMs can simultaneously measure and display the ac and dc components of a signal. 2  The DMM display can show results three ways (see illustration below): 3  The ac portion of the signal appears in the primary display and the dc portion in the smaller secondary display.
Each lichen specie is one alga species plus one fungus. The alga, a microscopic green plant, makes the food for the duo, while the fungus, a non-green plant, gives the pair support and soaks up moisture.
1 Lichens are fungi that live in a symbiotic association with an autotrophic green alga or cyanobacterium (the photobiont) or â in some cases â both. 2  The fungal partner (the mycobiont) in most lichens (98% of them) is an ascomycete. Some live in a mutually beneficial symbiotic relationship with another organism, often a plant. 2  The association of fungus and plant root is called a mycorrhiza. 3  Some 80% of land plants benefit from symbiotic mycorrhiza. 4  The plant benefits by more-efficient mineral (especially phosphorus) uptake.