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没有固定寿命的植物 在春天撒下牵牛花的种子，到了夏天便会盛开花朵并结成种子，入秋之后立即枯萎。依此看来，似乎可以认定牵牛花的寿命只有半年。但是，如果把萌芽的牵牛花一直放在暗处使它照不到光线，则即使在长出双子叶的阶段也会开花结实而枯萎。这时，它的寿命就变?
Plants with no fixed life The seeds of morning glory are sown in the spring, and in the summer they bloom and form seeds, and wither after the fall. From this perspective, it seems that the life-time of morning glory can be considered only six months. However, if the budding morning glory is kept in a dark place so that it does not shine light, even at the stage of dicotyledonous growth, it will bloom and wither. At this time, its life will change?