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Kingdom Fungi Assignment

2. Do photosynthetic fungi exist?  How do fungi nourish themselves?

All fungi are heterotrophs (meaning they do not perform photosynthesis). Fungi are decomposers; they eat and break down organic material.

The Classification of Fungi

3. Fungi constitute a kingdom. Into which phyla is the fungi kingdom divided? In which of those phyla are mushrooms classified?

The kingdom fungi is divided into four phyla: ascomycetes, basidiomycetes, zygomycetes and deuteromycetes.

Mushrooms are basidiomycetes. 

Fungi Structures

4. What are the hyphae and the mycelium of pluricellular fungi?

The main structures of pluricellular fungi are hyphae (threadlike filaments made of adjacent uni- or multinucleated cells) and the mycelium (a set of hyphae). 

Reproduction in Fungi

5. What types of reproduction occur in fungi?

In fungi, both asexual and sexual reproduction occur. Fungi reproduce asexually by fragmentation, gemmation and sporulation. Some species can reproduce sexually through the fusion of hyphae from different specimens, and even with metagenesis (alternation of generations). 

6. What are fruiting bodies?

Fruiting bodies are structures present in some fungi made of hyphae that project radially from the superior portion of the peduncle. These structures contain the reproductive cells of the organism. They form the umbrella-like cap in mushrooms (basidiocarp) or the ascocarp in ascomycetes.

Importance of Fungi

7. What is the ecological importance of fungi?

Fungi are heterotrophs and decomposers (they break down dead organisms) and actively participate in the recycling of organic material in ecosystems. Some fungi have a mutualist ecological relationship with algae or cyanobacteria, forming lichen, and with plant roots, forming mycorrhizas. 

8. What are some industrial uses of fungi?

Fungi are industrially used in the production of fermented beverages, bread, cheese, etc. Some fungi are very important for the production of medical drugs. Some fungi are processed to serve as food for humans, such as edible mushrooms.

9. What are lichens? How do fungi participate in this ecological interaction?

Lichens are formed through the mutualist ecological interaction between fungi and algae or between fungi and cyanobacteria. In this ecological interaction, the fungi absorb water that is then used by algae (or cyanobacteria), and the algae (or cyanobacteria), as autotrophs, produce organic material in excess to serve as food for the fungi. 

  • Fungi Kingdom Review - Image Diversity: lichens

10. What are mycorrhizas? How do both fungi and plants benefit from this ecological interaction?

Mycorrhizas are mutualistic ecological interactions between fungi and some plant roots. Fungi provide more water and mineral salts to the plant and obtain organic material from the plant in return.

Fungi and Diseases

11. What are the main human diseases caused by fungi?

The main human diseases caused by fungi are coccidioidomycosis, histoplasmosis, blastomycosis, paracoccidioidomycosis, or South American blastomycosis, sporotrichosis, aspergillosis and systemic candidiasis.

Fungi are also responsible for many dermatological diseases (dermatomycosis) that affect the skin, the nails, the scalp, etc.

On the other hand, many fungi are able to produce antibacterial substances that combat diseases. During the Second World War, in German jails, Russian prisoners that accepted to eat moldy bread had less skin infections than those that those who refused the food. In China, moldy soy sauce has been used against infections for thousands of years. Penicillin, a potent antibiotic, was discovered in 1928 by Alexander Fleming when he observed the antibacterial activity of fungi of the genus Penicillium

12. What is cyclosporin? How are fungi related to this substance?

Cyclosporin is a drug discovered in the 1970’s that revolutionized organ transplantation in Medicine. It is a powerful immunosuppressor, lowering immune activity of receptors and thus reducing the risk of the rejection of the transplanted organ.

Cyclosporin is a protein produced by the fungus Tolypocladium inflatum.

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