Energy spent on reproduction constitutes an organism’s “reproductive effort”. Th
ID: 134580 • Letter: E
Question
Energy spent on reproduction constitutes an organism’s “reproductive effort”. The figure below shows the relationship between reproductive effort (number of cones produced) and annual growth (as measured by radial growth) for the Douglas fir, Pseudotsuga menzieii. The line represents the general trend as defined by least-squares linear regression: y = -1.70x + 107.5 (n = 32; r2 = 0.71; p= 0.008). Answer the following questions:
4. What is the predicted relative width of annual rings in mm for a tree producing 1000 cones?
A) 4 (x 102)
B) 10 (x 102)
C) 82.5
D) 91.5
E) 107.5
5. For any given tree, increasing reproductive effort by one unit is expected to have which of the following effects?
A) increase number of cones by 100
B) decrease width of ring by 170 mm
C) both A and B
D) increase width of ring by 170 mm
E) not enough information to decide
Energy spent on reproduction constitutes an organism's "reproductive effort". The figure below shows the relationship between reproductive effort (number of cones produced) and growth measured as the relative width of annual rings for the Douglas fir, Pseudotsuga menzieii. The line represents the general trend as defined by the equation: y--1.70x+ 107.5; n 32, 12- 0.71, P-0.008. 120 115 E 110 S 105 100 95 6 90 85 80F 75 0 2 468 10 12 14 16 18 20 22 Mean number of cones per tree (x 10Explanation / Answer
4) E option is right : 107.5 here x=0.008 (y is depend on the variable x )
5) b option is right : decrease width ring by 170 mm.
because increasing reproductive effort by one unit there decrease in width ring by the rate of 1.70 (m=1.70 , slope). the slope is negative so at every unit it will be decresed.
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