[求助]一gwd题

k2o33

GWD-5-Q36:

It can be inferred from the passage that when aspen groves experience a “disturbance” (line 30), such a disturbance

             

1. leads to a hormonal imbalance within an aspen clone

2. provides soil conditions that are favorable for new shoots

3. thins out aspen groves that have become overly dense

4. suppresses the formation of too many new aspen stems

5. protects aspen groves by primarily destroying coniferous trees rather than aspens

If a clone
            loses many stems simultaneously, the
            resulting hormonal imbalance triggers a
            huge increase in new, rapidly growing
            shoots that can outnumber the ones
            destroyed.  An aspen grove needs to
            experience fire or some other disturbance
            regularly, or it will fail to regenerate and
            spread.

文章中disturbance明明是小白杨生长的需要，怎么在题目中就莫名奇妙的变成了它激素不平衡的原因了呢？