Use the Following Information to Answer the Question

question 48

Multiple Choice

Use the following information to answer the question.
Heterobasidion is a basidiomycete that contributes to mortality of trees. Kuhlman isolated 23 strains of Heterobasidion and applied them to 16 seedlings of 10 different tree species. Partial results of this experiment are shown in the table. (From Kuhlman, E. G. 1970. Seedling inoculations with Fomes annosus show variation in virulence and in host susceptibility. Phytopathology 60:1743-1746. https://www.apsnet.org/publications/phytopathology/backissues/Documents/1970Articles/Phyto60n12_1743.PDF)
% mortality of five host species from five Heterobasidion isolates

Which of the following conclusions can best be drawn from these results?

• A) All tree species are susceptible to Heterobasidion.
• B) Heterobasidion strains are equally lethal to all tree species.
• C) Heterobasidion reduces mortality of some species.
• D) Tree species vary in their susceptibility to Heterobasidion.

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Definitions:

Bacterial Sensitivity

The susceptibility of bacteria to various antibiotics, determined through specific tests to guide effective treatment.

Pressure Ulcers

Injuries to the skin and underlying tissue, primarily caused by prolonged pressure on the skin, often occurring in bedridden patients.

Shearing Forces

Stresses that cause layers of material to slide past one another, often leading to structural failure or injury.

Compromised Blood Flow

A condition where the normal circulation of blood is hindered, leading to inadequate oxygen and nutrient delivery to tissues.