1. What is the primary cause of most plant diseases?
a. Insects
b. Fungi
c. Bacteria
d. Viruses
Answer: b. Fungi
2. Which of the following is a common symptom of a viral plant disease?
a. Yellowing of leaves
b. Powdery mildew
c. Crown gall
d. Wilting
Answer: a. Yellowing of leaves
3. What is the term for the study and management of plant diseases?
a. Botany
b. Mycology
c. Phytopathology
d. Entomology
Answer: c. Phytopathology
4. Which pest is known for transmitting plant diseases by acting as a vector for pathogens?
a. Aphid
b. Caterpillar
c. Grasshopper
d. Ladybug
Answer: a. Aphid
5. What is the primary role of fungicides in agriculture?
a. Control weeds
b. Control fungal diseases
c. Control insect pests
d. Enhance soil fertility
Answer: b. Control fungal diseases
6. Which of the following is a fungal disease affecting wheat crops?
a. Citrus canker
b. Late blight
c. Rust
d. Crown gall
Answer: c. Rust
7. Which cultural practice can help prevent the spread of plant diseases in a garden?
a. Overwatering
b. Crop rotation
c. Monoculture
d. Ignoring sanitation
Answer: b. Crop rotation
8. What is the primary mode of action of systemic insecticides?
a. Contact with the insect’s exoskeleton
b. Ingestion by the insect
c. Repelling insects
d. Killing insects on contact
Answer: b. Ingestion by the insect
9. Which of the following is a biological control method for managing insect pests?
a. Synthetic pesticides
b. Genetic modification
c. Predatory insects
d. Chemical fertilizers
Answer: c. Predatory insects
10. What is the primary function of neonicotinoid insecticides?
a. Control nematodes
b. Repel mammals
c. Kill fungi
d. Target insect nervous systems
Answer: d. Target insect nervous systems
11. Which of the following is a parasitic flowering plant that can negatively impact crops by tapping into the host plant’s vascular system?
a. Clover
b. Dodder
c. Thistle
d. Bluegrass
Answer: b. Dodder
12. What is the primary symptom of a bacterial wilt infection in plants?
a. Yellowing of leaves
b. Wilting of the entire plant
c. Presence of powdery substance on leaves
d. Formation of galls
Answer: b. Wilting of the entire plant
13. Which of the following is a cultural control method for managing plant diseases?
a. Application of chemical pesticides
b. Crop rotation
c. Genetic modification
d. Soil sterilization
Answer: b. Crop rotation
14. What is the primary role of a pheromone trap in pest management?
a. Attract and kill pests
b. Repel pests
c. Monitor pest populations
d. Enhance soil fertility
Answer: c. Monitor pest populations
15. What is the primary function of a fungistatic agent?
a. Kill fungi on contact
b. Inhibit the growth of fungi
c. Repel insects
d. Boost plant immunity
Answer: b. Inhibit the growth of fungi
16. Which of the following is a vector for the transmission of the bacterial pathogen causing citrus greening disease?
a. Whitefly
b. Thrips
c. Leafhopper
d. Fruit fly
Answer: a. Whitefly
17. What is the primary mode of action of contact insecticides?
a. Ingestion by the insect
b. Absorption through plant roots
c. Killing insects on contact with their bodies
d. Disrupting insect hormones
Answer: c. Killing insects on contact with their bodies
18. Which fungal disease is commonly associated with damp and humid conditions, causing a fuzzy growth on plant surfaces?
a. Downy mildew
b. Anthracnose
c. Verticillium wilt
d. Botrytis blight
Answer: a. Downy mildew
19. What is the primary purpose of integrated pest management (IPM)?
a. Complete eradication of all pests
b. Minimizing the use of chemical pesticides
c. Promoting monoculture
d. Increasing the reliance on synthetic fertilizers
Answer: b. Minimizing the use of chemical pesticides
20. Which of the following is a common symptom of nematode infestation in plants?
a. Yellowing of leaves
b. Formation of cankers
c. Presence of galls on roots
d. Wilting due to water deficiency
Answer: c. Presence of galls on roots