在实验室里用一定容积的密闭容器培养某种酵母菌,每隔4h统计容

 在实验室里用一定容积的密闭容器培养某种酵母菌,每隔4h统计容器中酵母菌的个体数量,得数据如下表,下列说法正确的是

时间

0

4

8

12

16

20

数量(相对值)

10

71

350

595

656

665

答案

D


解析:

本题考查有限条件下,酵母菌种群数量的变化,属理解层次。酵母菌主要在有氧条件下进行孢子生殖,而不是二分裂;在有限条件下,时间再延长,种群数量将会减少,进入衰退;增长速率最大在0~4h内,增长速率为6;在12h后,增长速率渐小,主要是由于环境条件有限,导致种内斗争加剧的结果。

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