Ch. 31 - Chapter 31 Fungi Book Notes Overview 31.1 Fungi...

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Chapter 31 Fungi Book Notes Overview 31.1 – Fungi are Heterotrophs that feed by absorption 31.2 – Fungi produce spores through sexual or asexual life cycles 31.3 – Fungi descended from an aquatic single-celled, flagellated protist 31.4 – Fungi have radiated into a diverse set of lineages 31.5 – Fungi have a powerful impact on ecosystems and human welfare Summary Table Key Terms Overview
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Fungi o Are diverse and widespread o Are essential for the well-being of most terrestrial ecosystems because they break down organic material and recycle vital nutrients Section 31.1 Despite their diversity fungi share some key traits Fungi are Heterotrophs but do not ingest their food Fungi secrete into their surroundings exoenzymes that break down complex molecules and the absorb the remaining smaller compounds Nutrition and Fungal Lifestyles o Fungi exhibit diverse lifestyles Decomposers Parasites Mutualistic symbionts Body Structure o The morphology of multicellular fungi enhances their ability to absorb nutrients from their surroundings o Fungi consist of mycelia, networks of branched hypgae adapted for absorption o Most fungi have cell walls made of chitin o Some fungi have hyphae divided into cells by septa, with pores allowing cell-to-cell movement of materials o Coenocytic fungi lack septa o Some unique fungi have specialized hyphae that allow them to penetrate the tissues of their host (called haustoria) o Mycorrhizae are mutually beneficial relationships between fungi and plant roots Section 31.2 Reproduction
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o Fungi propagate themselves by producing vast numbers of spores, either sexually of asexually o The sexual life cycle involves Cell fusion, plasmogamy Nuclear fusion, karyogamy
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Ch. 31 - Chapter 31 Fungi Book Notes Overview 31.1 Fungi...

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