Page 67 - MODUL SASING XII NEW_EDIT TIM

3. It can be inferred from the author’s discussion of Pseudomonas fl uorescens bacteria that which
one of the following would be true of crops impervious to parasitical organisms?
A. Pseudomonas fl uorescens bacteria would be absent from the soil surrounding their
roots.
B. They would crowd out and eventually exclude other crop plants if their growth were not
carefully regulated.
C. Their yield would not be likely to be improved by adding Pseudomonas fl uorescens
bacteria to the soil.
D. They would mature more quickly than crop plants that were susceptible to parasitical
organisms.
E. Levels of phytopathogenic bacteria in the soil surrounding their roots would be higher
compared with other crop plants.

4. It can be inferred from the passage that crop rotation can increase yields in part because ....
A. moving crop plants around makes them hardier and more resistant to disease
B. the number of Pseudomonas fl uorescens bacteria in the soil usually increases when
crops are rotated
C. the roots of many crop plants produce compounds that are antagonistic to
phytopathogens harmful to other crop plants
D. the presence of phytopathogenic bacteria is responsible for the majority of plant
diseases
E. phytopathogens typically attack some plant species but fi nd other species to be
unsuitable hosts

5. According to the passage, proponents of the use of genetically altered bacteria in agriculture
argue that which one of the following is true of the altered bacteria used in the frost-damage
experiments?
A. The altered bacteria had a genetic constitution differing from that of the normal strain
only in that the altered variety had one less gene.
B. Although the altered bacteria competed effectively with the nonaltered strain in the
laboratory, they were not as viable in natural environments.
C. The altered bacteria were much safer and more effective than the naturally occurring
Pseudomonas fl uorescens bacteria used in earlier experiments.
D. The altered bacteria were antagonistic to several types of naturally occurring
phytopathogens in the soil surrounding the roots of frost-damaged crops.
E. The altered bacteria were released into the environment in numbers suffi cient to
guarantee the validity of experimental results.

6. _______ the price of gold rises sharply, people keep buying it.
A. However
B. Eventhough
C. Nevertheless
D. Inspite of
E. On the other hands

60