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lab_quiz1 - Copy - Hyperplasia is an abnormal increase in...

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Lab Quiz #1 Name: Date: Section: 1. (1 pt) Define the term symptom. A symptom is a visible expression of a disease on the infected plant. 2. (2 pts) Give two examples of symptoms and define both terms. Leaf spot is a discoloration of the leaf in spots. Necrosis is the death of cells or tissue that usually causes black or brown discoloration. 3. (2 pts) Give two types of necrotic symptoms and define both terms. A lesion is a discrete or localized necrotic area. Vascular discoloration is caused by vascular pathogens or wood rotters and is the necrosis of the plant’s vascular tissue 4. (4 pts) Differentiate between hypertrophy and hyperplasia. Give two types of symptoms that are the result of hypertrophy and hyperplasia. Bonus (1 pt) List two types of pathogens that cause hypertrophy and hyperplasia in plants. Hypertrophy is the abnormal increase in the size of cells.
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Unformatted text preview: Hyperplasia is an abnormal increase in the number of cells. Hypertrophy and hyperplasia usually results in galls or tumors forming. Crown gall Agrobacterium tumefaciens and Corn Smut Ustilago zeae are two pathogens that cause hypertrophy and hyperplasia 5. (1 pt) Define the term sign. A sign is a part of the pathogen visible on host tissue. 6. (2 pts) Give two examples of a sign and define both terms. Sclerotia are a compact mass of hyphae surrounded by a darkened shell. Perithecia are a type reproductive structure. 7. (2 pts) Define the term halo. What other symptom are haloes generally associated with on plants? A halo is a circular ring of discoloration and is commonly found with necrotic symptoms. 8. (1 pt) What is a mosaic? A mosaic is an alternating pattern of light and dark green tissue on a plant normally caused by a virus...
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This note was uploaded on 03/22/2008 for the course PP 315 taught by Professor Shew during the Spring '08 term at N.C. State.

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lab_quiz1 - Copy - Hyperplasia is an abnormal increase in...

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