Chapter 2 Self-test questions

. Which is the best description of fungi?

Micro-organisms.

Prokaryotic, heterotrophic organisms with chitin in cell walls.

Organisms which are edible by humans.

Eukaryotic, heterotrophic organisms with chitin in cell walls.

. How did powdery mildew diseases get their name?

They produce large amounts of sexual spores causing a powdery appearance to leaves.

Powdery chemicals are produced by the host to fight the infection.

They produce large amounts of asexual spores on affected parts of the plant.

The leaves break up into a powder when crushed.

. Which of the following plant pathogen is not an oomycete?

Phytophthora kernoviae.

Downy mildew.

Powdery mildew.

Pythium ultimum.

. Which of the following naming methods best identifies a single fungal species?

Latin binomial.

Common name.

Family and class.

Disease symptoms.

. Black stem rust is a disease that affects cereal crops. It is particularly difficult to overcome because it…

Can be vectored in the guts of sap-sucking insects.

Overwinter on different host plants.

Have 6 or more different spore types.

Can be a facultative plant pathogens.

. Which of these is not a spore type associated with phytophthoras?

Zoospore.

Chlamydospore.

Condiospore.

Oospore.

. Which of the following is not an ascomycete fungal disease?

Venturia inaequalis (apple scab).

Diplocarpon rosae (Rose black-spot).

Monilinia fructicola (Brown rot of plum).

Puccinia graminis (Black stem rust of wheat).

. What is the best part of a necrotic leaf to isolate a fungal pathogen from?

The leading edge of the necrotic lesion.

Shouldn't isolate as necrosis is never due to fungal plant pathogens.

The middle of the necrotic lesion.

The stalk of the leaf.

. Ash dieback fungus (Hymenoscyphus fraxineus) causes all of the following diseases symptoms except one. Which is the odd one out? the following major disease symptoms…

Trunk cankers.

Internal necrosis causing brown staining.

Leaf death.

Root rot.

. Which of the following methodologies is not used to help diagnose fungal diseases?

Microscopy.

Incubation and isolation.

Cell wall cellulose analysis.

Gene sequencing.

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