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Describe the life cycle of a named parasitic fungus, which causes a disease in a crop, under the following headings: (i) Mode of reproduction - Leaving Cert Agricultural Science - Question b - 2006
Question b
Describe the life cycle of a named parasitic fungus, which causes a disease in a crop, under the following headings: (i) Mode of reproduction. (ii) Mode of nutrition... show full transcript
Worked Solution & Example Answer:Describe the life cycle of a named parasitic fungus, which causes a disease in a crop, under the following headings: (i) Mode of reproduction - Leaving Cert Agricultural Science - Question b - 2006
Step 1
Mode of reproduction.
Answer
The life cycle of a named parasitic fungus, such as Phytophthora infestans, which causes potato blight, begins with the production of spores. These spores are released into the environment and are capable of being spread by wind or water. Once they land on a suitable host plant, they germinate and produce new hyphae.
Step 2
Mode of nutrition.
Answer
The fungus obtains nutrition through specialized structures called hyphae or haustoria. These hyphae penetrate the cell walls of the host plant, allowing the fungus to digest the organic matter present. Nutrients from this digested material are then absorbed through the hyphae, facilitating the growth and sustenance of the fungus.
Step 3
Environmental conditions that favour the spread of the disease.
Answer
The spread of potato blight is favoured by damp weather conditions. High humidity and moisture levels create an ideal environment for spore germination and fungal growth, increasing the likelihood of infection in crops.