BIOL 1202 Chapter : Fungi
Document Summary
Concept 31. 1: fungi are heterotrophs that feed by absorption. Fungi are heterotrophs, but do not ingest their food. Secrete exoenzymes into their surroundings that break down complex molecules. The morphology of multicellular fungi enhances absorption of nutrients. Fungi consist of hyphae that are grouped together into mycelia. Most fungi have cell walls made up of chitin. (figure 31. 2) Some fungi have hyphae divided into cells by septa, with pores allowing cell-to- cell movement of materials. Allow them to capture animals and penetrate tissues of the host. Mycorrhizae = mutualisms between fungi and plant host. Endomycorrhizae = extends hyphae through root-cell wall. Concept 31. 2: fungi produce spores through sexual or asexual life cycles. Heterokaryotic stage is between plasmogamy and karyogamy: cells have haploid nuclei from two parents. The diploid phase following karyogamy is short lived and undergoes meiosis, producing haploid spores. Many fungi such as molds produce spores asexually on conidia.
