20.如下图所示.三条曲线分别表示三个不同种群的存活曲线.下列关于这三条曲线的描述错误的是 A.种群工在生命早期的死亡率极高.一旦活到某一年龄后.死亡率就变得低而且稳定 B.种群Ⅱ在各个年龄段的死亡率基本相等 C.种群Ⅲ在早期死亡率极低.绝大多数个体能活到一定年龄后在短期内几乎全部死亡 D.种群Ⅲ为衰退型 查看更多

 

题目列表(包括答案和解析)

某水塘内有一条由三种不同生物形成的食物链;硅藻→虾→小鱼,如图中的曲线分别表示该食物链中各生物在水塘不同深度的分布状况。下列相关分析错误的是(  )

A.物种C表示小鱼,该种群营养级最高,所含能量最少

B.硅藻、虾、小鱼构成了一个生物群落

C.物种B的数量突增,短时间内C的数量会增加

D.物种A、B、C之间一定存在生殖隔离

 

查看答案和解析>>

某水塘内有一条由三种不同生物形成的食物链;硅藻→虾→小鱼,如图中的曲线分别表示该食物链中各生物在水塘不同深度的分布状况。下列相关分析错误的是(  )

A.物种C表示小鱼,该种群营养级最高,所含能量最少

B.硅藻、虾、小鱼构成了一个生物群落

C.物种B的数量突增,短时间内C的数量会增加

D.物种A、B、C之间一定存在生殖隔离

 

查看答案和解析>>

 

30、Ⅰ(7分)为探究环境因素对植物光合作用强度的影响,设计进行如下实验:

实验材料和用具:图示实验装置(广口瓶容积为500mL)、100 mL量筒、200W的台灯、冷开水、不同浓度的NaHCO3溶液(冷开水配制)、黑藻等。实验重复三次,实验结果见下表。                                                                                                                                            

 

分析并回答下列有关问题:

(1)该实验中的自变量是            ,列出实验中的至少两个控制变量(无关变量):

                                       

(2)试补充完成该实验探究的具体实验步骤。                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

①准备4套如图装置,编号为1----4,分别在各瓶中注入冷开水、0.1%NaHC03溶液、1.0%NaHC03溶液、5.0%NaHC03溶液各约500mL;

②取                                    ,分别放入各实验装置,并组装好实验装置;

③将4套装置             ,然后分别用                   

④30min后,                                      

⑶由于黑藻自身呼吸作用会消耗氧气,故量筒中收集到的水的体积

不能表示为黑藻30min内的光合总量,请根据上表绘制出相关的

柱形图。

 

 

 

 

 

 

 

 

 

 

 

 

Ⅱ(5分)植物的光合作用受内、外多种因素的影响,如图是在20℃、0.03%CO2浓度条件下,测得A、B两种植物在不同光照条件下光合速率变化曲线。请据图回答问题:

(1)图示表明,       植物更适宜在弱光照条件下生长,这是由植物本身的              决定的。生产上如果将A、B共同种植,形成群落的         结构,将可达到充分利用光能的目的。

(2)在昼夜周期条件下(12h光照、12h黑暗),A植物需在光照强度___   __千勒克斯才能生长。

(3)当光照强度为8千勒克斯时,A植物每小时光合作用所制造的有机物量与B植物制造的有机物量的比例是        

 

查看答案和解析>>



30、Ⅰ(7分)为探究环境因素对植物光合作用强度的影响,设计进行如下实验:
实验材料和用具:图示实验装置(广口瓶容积为500mL)、100 mL量筒、200W的台灯、冷开水、不同浓度的NaHCO3溶液(冷开水配制)、黑藻等。实验重复三次,实验结果见下表。                                                                                                                                           
分析并回答下列有关问题:

(1)该实验中的自变量是           ,列出实验中的至少两个控制变量(无关变量):
                                       
(2)试补充完成该实验探究的具体实验步骤。                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
①准备4套如图装置,编号为1----4,分别在各瓶中注入冷开水、0.1%NaHC03溶液、1.0%NaHC03溶液、5.0%NaHC03溶液各约500mL;
②取                                   ,分别放入各实验装置,并组装好实验装置;
③将4套装置            ,然后分别用                   
④30min后,                                      
⑶由于黑藻自身呼吸作用会消耗氧气,故量筒中收集到的水的体积
不能表示为黑藻30min内的光合总量,请根据上表绘制出相关的
柱形图。


Ⅱ(5分)植物的光合作用受内、外多种因素的影响,如图是在20℃、0.03%CO2浓度条件下,测得A、B两种植物在不同光照条件下光合速率变化曲线。请据图回答问题:
(1)图示表明      植物更适宜在弱光照条件下生长,这是由植物本身的             决定的。生产上如果将A、B共同种植,形成群落的        结构,将可达到充分利用光能的目的。
(2)在昼夜周期条件下(12h光照、12h黑暗),A植物需在光照强度___  __千勒克斯才能生长。
(3)当光照强度为8千勒克斯时,A植物每小时光合作用所制造的有机物量与B植物制造的有机物量的比例是        

查看答案和解析>>


同步练习册答案