AlbertNTN wrote:
Urban air contains more sulfur dioxide than does rural air, and plants in cities typically grow more slowly than do plants in rural areas. In an experiment to see how much of the difference in growth is due to sulfur dioxide, classes in an urban and a rural school grew plants in greenhouse at their schools and filtered the greenhouse air to eliminate sulfur dioxide. Plants in the urban greenhouse grew more slowly than those in the rural greenhouse.
Which of the following, if true, would it be most important to take into account in evaluating the result?
a. The urban school was located in a part of the city in which levels of sulfur dioxide in the air were usually far lower than is typical for urban areas
b. At both schools, the plants in the greenhouses grew much more quickly than did plants planted outdoors in plots near the greenhouse
c. The urban class conducting the experiment was larger than the rural class conducting the experiment
d. Heavy vehicular traffic such as is found in cities constantly deposits grime on greenhouse windows, reducing the amount of light that reaches the plants inside
e. Because of the higher levels of sulfur dioxide in the air at the urban school, the air filters for the urban schools greenhouse were changed more frequently than were those at the rural school
Pls add in details of how u tackle the qsn. Thks
Which of the following, if true, would it be most important to take into account in evaluating the result?
a. The urban school was located in a part of the city in which levels of sulfur dioxide in the air were usually far lower than is typical for urban areas
b. At both schools, the plants in the greenhouses grew much more quickly than did plants planted outdoors in plots near the greenhouse
c. The urban class conducting the experiment was larger than the rural class conducting the experiment
d. Heavy vehicular traffic such as is found in cities constantly deposits grime on greenhouse windows, reducing the amount of light that reaches the plants inside
e. Because of the higher levels of sulfur dioxide in the air at the urban school, the air filters for the urban schools greenhouse were changed more frequently than were those at the rural school
Pls add in details of how u tackle the qsn. Thks
I was split between B and D on this one.
B is suggesting that something in addition to SO2 was affecting plant growth in urban areas but nonetheless SO2 is indeed a factor. I think this ties together the effect the question is trying to determine.
D is directly saying that because urban greenhouses received less light, they grew less which implies that the plants in urban areas would have grew like the ones in rural areas had it not been for grime.
I feel as if B is implying other variables while D is directly stating it...perhaps thats why D is a better choice.