P共t兲 苷
250 750ke
t兾25
1 ke
t兾25
33. ; 0.2275 kg兾L
35. (b) (c)
EXERCISES 10.6
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1. (a) , ; growth is restricted only by
predators, which feed only on prey.
(b) , ; growth is restricted by carrying
capacity and by predators, which feed only on prey.
3. (a) The rabbit population starts at about 300, increases to 2400,
then decreases back to 300. The fox population starts at 100,
decreases to about 20, increases to about 315, decreases to 100,
and the cycle starts again.
(b)
5.
9.
(a) Population stabilizes at 5000.
(b) (i) , : Zero populations
(ii) , : In the absence of wolves, the rabbit
population is always 5000.
(iii) , : Both populations are stable.
(c) The populations stabilize at 1000 rabbits and 64 wolves.
(d)
CHAPTER 10 REVIEW
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True-False Quiz
1.
True 3. False 5. True 7. True