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Subject Test Biology

Question 4 of 5

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SAT Subject Test

Known numbers of seeds from two species (X and Y) of annual plants are mixed together in different proportions and planted in five small plots of soil in the spring. The plants grow, flower, and produce seeds. It is found that the percentage of seeds of species X and species Y in the harvest is usually different from the proportion that was planted, although the total number of seeds produced is the same as the number of seeds planted. The data are plotted on the graph below.

GRAPH

What mixture of seeds was harvested in the plot that was planted with 25 percent species X and 75 percent species Y?

 

  X Y
(A) 25% 75%
(B) 40% 60%
(C) 50% 50%
(D) 60% 40%
(E) 75% 25%

Select an Answer

A

Correct Answer: 
No

B

Correct Answer: 
No

C

Correct Answer: 
Yes

D

Correct Answer: 
No

E

Correct Answer: 
No

The graph shows that when the mixture of seeds planted contained 25% species X (and therefore 75% species Y, to make 100%), 50% of the seeds harvested were species X. If 50% of the seeds harvested were species X, the other 50% of the seeds harvested must have been species Y.

Question Difficulty: 
medium