8.02

Rosa found distorted patterns of mottled colors—dark green, light green, yellow, and white—on the young leaves of her plants. This condition, caused by viruses, is called:

• Canker

• damping-off

• mosaic

• smut

Brad read online that bacteria are what type of microorganisms?

• Double-celled

• General

• Particular

• Single-celled

Samantha learns that for a plant to contract a disease it must have:

• an ailment

• dry soil

• an insect problem

• a pathogen

Diseases are common with horticultural crops because most plants are grown in highly moist conditions and at warm temperatures that make a favorable:

• acidity

• environment

• genetics

• repellent

After Paula smoked a cigarette during her break at work, her boss made sure she washed her hands before handling the tomato plants. What could she spread to the tomato plants?

• Damping-off

• Leaf spot

• Mildew

• Mosaic virus

What symptoms does Pam see if her seedlings have a damping-off problem?

• Circular black spots on upper leaf surface

• Rusty growth on upper leaf surface of seedlings

• Seedlings rotting off at soil level

• White coating on plant leaves

Viral, fungal, and bacterial describe the origin for types of:

• diseases

• germination

• pollination

• plants

Noah learns that tobacco mosaic virus can also attack:

• corn

• radishes

• rubber plants

• tomatoes

Fernando notices that his plants have quickly turned brown and look as though they had been burned. What disease is most likely causing this problem?

• Bacterial blight

• Damping-off

• Leaf spot

• Mildew