中国科学院院士袁隆平在培育超级杂交水稻时,专门挑选叶片直、窄

中国科学院院士袁隆平在培育超级杂交水稻时,专门挑选叶片直、窄、厚的水稻植株,其目的是( )                                             

A、促进植物的呼吸    B、减少二氧化碳的吸收量

C、加快蒸腾作用      D、叶片互不遮挡,两面受光,增加光合作用功效

 

答案

D

解析:略

 

相关题目

如图所示,在纪念抗日战争胜利70周年阅兵仪式中,某直升飞
如图所示,在纪念抗日战争胜利70周年阅兵仪式中,某直升飞机在地面上空某高度A位置处于静止状态待命,要求该机10时56分40秒由静止状态沿水平方向
A volcanic eruption in Iceland has sent ash across northern Europe. Airlines hav
A volcanic eruption in Iceland has sent ash across northern Europe. Airlines have stopped or changed the flights across the Atlantic Ocean, leaving airport hundreds of passengers stuck in airport. Gri
某养鸡场自制电热孵化器用来孵小鸡。孵化器电阻丝的阻值
某养鸡场自制电热孵化器用来孵小鸡。孵化器电阻丝的阻值为22 Ω,额定电压为220 V, 把它接在家庭电路中。 求:⑴工作时通过孵化器的电流;  ⑵ 孵化
已知||=3,||=2,<0,则的值等于(     )A.5或-5      
已知||=3,||=2,<0,则的值等于(     )A.5或-5       B.1或-1        C.5或1       D.-5或-1 
阅读下面的短文,请根据短文后的要求答题(注意问题后的
阅读下面的短文,请根据短文后的要求答题(注意问题后的字数要求) [1] Do you ever wish you were as thin as a model or as strong as your favorite football player? Maybe you
_____ from heart trouble for years, Professor White has to take some medicine wi
_____ from heart trouble for years, Professor White has to take some medicine with him wherever he goes. A. Suffered                   B. Suffering      C. Being suffered   
I still remember _______ to my home town when I was young. A. taking      
I still remember _______ to my home town when I was young. A. taking        B. taken               C. being taken        D. to take
在各种金属材料中铜是人类应用比较广泛的金属之一,某学
在各种金属材料中铜是人类应用比较广泛的金属之一,某学习小组欲测定铜的相对原子质量,设计如图1所示实验方案: 实验步骤:①连接好装置;②

最新题目