1. Variation in reproductive effort explains what percent of the variation in tr
ID: 134582 • Letter: 1
Question
1. Variation in reproductive effort explains what percent of the variation in tree ring width?
A) 0.8
B) 1.70
C) 71
D) 107.5
E) not enough information to decide
2. These data _____ the existence of an energetic trade-off between reproduction and growth in the Douglas fir.
A) prove
B) are consistent with
C) disprove
D) are inconsistent with
E) are not relevant to
3. 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
1) The correlation equation is, y = -1.70x + 107.5
So, variation in reproductive effort explains 1.70 percent of the variation in tree ring width.
2) These data are consistent with the energetic trade off between reproduction and growth in the Douglas fir.
3) Increase in reproductive effort by one unit is expected to increase the number of times by 100 and decrease the width of the ring by 170 mm (option c).
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