问题 填空题

“一年之际在于春”。春天是多数农作物的播种季节,春天更是万物生长的季节。 勤劳的农民伯伯又开始了一年的劳作。请你利用所学过的生物学知识,为农民伯伯解答下列在生产、生活中遇到的问题。

(1)3月12日前后,张大爷在新居的前后栽种树苗,开始几天出现了萎蔫现象,你认为出现这种现象的主要原因是损伤了___________;而且移栽的树苗还要去掉大量的枝叶,其原因是_________。

(2)春寒料峭,李大妈在播种棉花种后,为促使种子能提早萌发,你认为应该采取的措施是_________;棉花苗期间要经常锄地松土,原因是经常松土有利于___________。

(3)春暖柳吐绿,王大爷剥开嫩绿的柳树枝条,发现树皮内有呈浅绿色并且比较黏滑的一层薄膜,它就是木本植物茎结构中的___________;在夏季暴风雨中,王大爷还发现粗壮的杨树有时会连根拔起,而树干却折不断。这是因为______________。

(4)在小麦的拔节期,王伯伯发现植株长的柔弱、纤细、容易倒伏,这时要多施含的_________化学肥料;如果一次施肥过多后,出现大面积的萎蔫现象,应采取的补救措施是_____________。

(5)张大叔家西瓜大丰收,西瓜是夏季最解暑的水果之一。果实内富含有机物,这些有机物是通过植物体内的______________运输到果实内的;其运输方向是________________。

答案

(1)幼根和根毛   降低蒸腾作用

(2)用塑料薄膜覆盖(地面)   根进行呼吸(作用)

(3)形成层   木质部发达(坚硬)

(4)钾    多浇水

(5)(韧皮部的)筛管    自上而下

完形填空
完形填空。
      Billy is a boy of fifteen. His parents died three years ago. One day when he was walking in the street, he
   1   a wallet. He returned it to the owner, Mr Baker. He gave his   2   to the boy. As the boy had no job, Mr
Baker made him work for him in his   3  . Billy worked so hard that Mr and Mrs Baker were   4   with him.
     Mr Baker loved planting   5  . The week before last, he brought a few trees home, planted them in the   6   
himself and watered them every day. Several days   7  , he had to leave for another city. Before he started, he
said to Billy,"Take good care of these trees. Some boys near our house always want to steal them.""Don't   8   
about them, sir."answered Billy,"I'll try my best to watch them."Six days passed and Mr Baker came back. He
asked," 
  9   anyone ever come to steal the trees?" "No, sir."said Billy. "To stop someone from stealing the trees, I   10 
 them up six days ago. I have hidden them for almost a week!"
( )1. A. bought  
( )2. A. wallet  
( )3. A. office  
( )4. A. pleased 
( )5. A. grass   
( )6. A. garden  
( )7. A. ago     
( )8. A. think   
( )9. A. Did     
( )10. A. sent   
B. found       
B. pity        
B. factory    
B. angry        
B. flowers  
B. office   
B. later         
B. talk     
B. Does           
B. pulled 
C. carried            
C. thanks                
C. town               
C. bored                   
C. vegetables      
C. city              
C. before              
C. learn          
C. Has                       
C. put        
D. wanted           
D. excuses              
D. home               
D. sad                      
D. trees          
D. room             
D. after                
D. worry            
D. Will               
D. picked         
单项选择题