plant disease caused by nematodes

Which of the following is a common symptom of plant disease caused by nematodes?

• Wilting of stems
• Browning of roots
• Yellowing of leaves
• All of the above

What type of nematode is responsible for root-knot disease?

• Meloidogyne spp
• Pratylenchus spp
• Heterodera spp
• Tylenchulus spp

How do nematodes damage plants?

• By all of the above
• By feeding on plant cells
• By releasing toxins that affect the plant's metabolism
• By causing physical damage to the plant's tissues

What is the most effective method of controlling nematode infestations?

• None of the above
• Using chemical pesticides
• Crop rotation
• Using organic pesticides

Which of the following is a cultural control method for nematodes?

• Using resistant plant varieties
• Sterilizing soil
• Planting cover crops
• All of the above

What is the role of nematodes in soil ecology?

• They are important decomposers
• They are important pollinators
• They have no role in soil ecology
• They are important predators of other soil organisms

What is the life cycle of nematodes?

• Egg-larva-pupa-adult
• Egg-nymph-adult
• Egg-larva-pupa-chrysalis-adult
• Egg-juvenile-adult

What is the size of a typical nematode?

• 1 mm to 5 mm
• 10 mm to 15 mm
• 5 mm to 10 mm
• 15 mm to 20 mm

Which of the following is a non-chemical control method for nematodes?

• Using resistant plant varieties
• Fumigation
• Solarization
• None of the above

What is the name of the nematode that causes citrus nematode disease?

• Pratylenchus spp
• Tylenchulus spp
• Meloidogyne spp
• Heterodera spp