在春季进行树苗移栽时,常常要剪掉树苗的部分枝叶,这样做的目的

在春季进行树苗移栽时,常常要剪掉树苗的部分枝叶,这样做的目的是(  

A.植物刚移栽,所需要的营养物质少,要降低树苗光合作用强度

B.刚移栽的树苗光合作用制造的有机物少,要降低树苗光合作用强度

C.这样做整理了树形,使移栽的树苗更富有观赏价值

D.这样做,降低了植物的蒸腾作用,有利于所移栽的植物成活

答案

D

相关题目

人体所必需的“钙、铁、锌、硒”仅从食物中摄取不足时,
人体所必需的“钙、铁、锌、硒”仅从食物中摄取不足时,可通过食品添加剂和保健药剂来予以补充,这里的“钙、铁、锌、硒”是指    (  ) A.原子
A fellow speaker from California named Geri flew to Japan, in her favorite jean
A fellow speaker from California named Geri flew to Japan, in her favorite jeans and a casual jacket, to give her first speech. Fourteen hours later, four perfectly dressed Japanese gentlemen greet
Galileo was considered one of the _____ of modern science. A. discoverers    
Galileo was considered one of the _____ of modern science. A. discoverers     B. inventors      C. founders        D. settlers  
《夜雨寄北》中表现诗人思念朋友、渴望重聚的句子是    
《夜雨寄北》中表现诗人思念朋友、渴望重聚的句子是         ,         。
I ______ for the bus for about 40 minutes, but it hasn’t come yet. A. am wait
I ______ for the bus for about 40 minutes, but it hasn’t come yet. A. am waiting     B. have waited   C. have been waiting    D. will be waiting  
People ________ hobbies which offer enjoyment, knowledge and relaxation. A.bri
People ________ hobbies which offer enjoyment, knowledge and relaxation. A.bring up  B.set up C.pick up  D.take up  
1927年4月18日,蒋介石发表演讲,否认国共合作,还诬蔑共
1927年4月18日,蒋介石发表演讲,否认国共合作,还诬蔑共产党加入国民党为“孙悟空投胎于人身,以其翻筋斗的花样,把人身体中的五脏六腑扰
A
A

最新题目