V. Concept of Plant Disease

Question 1

PLANT DISEASE

Answer 1

1. disturbance in physiological process caused by pathogen
2. changes in form, function, and integrity of plant

Question 2

SALIENT FEATURES OF PLANT DISEASES

Answer 2

1. caused by pathogen
2. abnormal physiological process
3. abnormal morphology
4. reduction in economic value

Question 3

PHYSIOLOGICAL PROCESSES AFFECTED BY PLANT DISEASE

Answer 3

1. translocation
2. photosynthesis
3. transpiration
4. respiration
5. permeability
6. transcription and translation
7. absorption

Question 4

MODE OF ACTION OF PATHOGEN

Answer 4

1. disturb metabolism
2. directly absorb nutrients
3. grow in plant organs

Question 5

AFFECTED PHYSIOLOGICAL PROCESS: LEAF INFECTION

Answer 5

1. photosynthesis

Question 6

AFFECTED PHYSIOLOGICAL PROCESS: XYLEM INFECTION

Answer 6

1. translocation of water and minerals

Question 7

AFFECTED PHYSIOLOGICAL PROCESS: PHLOEM INFECTION

Answer 7

1. downward translocation of photosynthetic products

Question 8

AFFECTED PHYSIOLOGICAL PROCESS: ROOT INFECTION

Answer 8

1. absorption of nutrients

Question 9

AFFECTED PHYSIOLOGICAL PROCESS: FLOWER AND FRUIT INFECTION

Answer 9

1. reproduction