The mode of nutrition in fungi

The correct option is "saprotrophic or parasitic".

Fungi are heterotrophic organisms, meaning they cannot manufacture their own food through photosynthesis like plants do. Instead, they must obtain nutrients from external organic sources. Fungi exhibit two primary modes of heterotrophic nutrition depending on where they source their organic matter:
1. Saprotrophic Nutrition: The majority of fungi are saprotrophs (or saprophytes). They feed on dead, decaying, or non-living organic matter. They do this by secreting digestive enzymes directly onto the substrate, which breaks down complex organic materials into simpler, soluble substances that the fungi then absorb through their cell walls.
2. Parasitic Nutrition: Some fungi live on or inside other living organisms (hosts) and absorb nutrients directly from the host's cells. This parasitic relationship often harms the host, causing various diseases in plants, animals, and humans.

Since fungi can obtain their nutrition by either breaking down dead organic matter (saprotrophic) or by exploiting living hosts (parasitic), their mode of nutrition is described as saprotrophic or parasitic.