plant diseases

What type of disease is tobacco mosaic?

• Fungal

• Viral

• Bacterial

• Deficiency

How can plant diseases be identified?

• Microscopy

• Monoclonal antibodies

• DNA testing

Why do plants infected with TMV have stunted growth?

• TMV kills new cells

• TMV causes water loss, causing the plant to shrink

• The plant is unable to photosynthesise

How can TMV infection be prevented?

• Keeping plants in a sterile environment

• Using insecticides

• Minimising contact

• Using antibacterial sprays

Antibiotics can be used to treat what type of infection?

• Fungal

• Viral

• Bacterial

Which of the following are entry points for bacteria?

• mechanical injuries and woulds made by insect feeding
• spores
• stomata and nectaries
• both mechanical injuries, wounds from insect feeding, stomata, and nectaries

Symptoms of anthracnose include:

• dead areas on leaves usually along leaf margins and veins
• localized areas of dead bark and underlying wood on twigs, branches, and trunks
• root tips that are brown and dead
• a dry, powdery, reddish-orange substance on leaves

Viral diseases can be transferred from plant to plant by:

• vegetative propagation
• mites, nematodes, and thrips
• hands and tools
• all of these

Which nutrients are required in relatively large amounts for plant growth?

• manganese, iron, and copper
• nitrogen, phosphorus, potassium, and calcium
• zinc, sulfur, and boron
• all of these

What are the facultative parasites most likely to attack stressed plants?

• fungi
• epiphyte
• galls
• moss