皮皮学，免费搜题
登录
搜题
【简答题】
为探究“种子萌发的环境条件”，设计了如下实验： 取四个烧杯分别贴上1、2、3、4号标签，在各烧杯内放入适量的泥土，分别种上20粒干燥、同品种的玉米种子．在有光条件下，各实验变量及一后种子的萌发情况见下表： 实验编号 1 2 3 4 温度（℃） 25 25 0 25 泥土干湿度 干燥 潮湿 潮湿 浸没在水中 空气 充足 充足 充足 不充足 种子发芽数（粒） 0 19 0 1 （1）实验所用到的玉米种子除形状大小基本相同外，还应相同的是______； （2）进行1号和2号实验对比研究的方案设计时，基于的假设是______； （3）如果还要探究种子萌发是否需要光，还需设计的一个实验是______．
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Section A Directions: This section is to test your ability to give proper answers to questions. There are 5 recorded questions in it. After each question, there is a pause. The questions will be spoke...
A.
Yes, we'll meet.
B.
Of course, we will.
C.
How about tomorrow?
D.
At the school gate.
【简答题】“江山易改,禀性难移”这句话说明了A. 人格的稳定性 B. 性格的社会性 C. 能力的先天性 D. 意志的薄弱性 E. 人格的独特性
【单选题】?Read the following extract from an article about monopolistic competition, and the questions followed. ?For each question 15—20, mark one letter (A, B, C, or D) on your Answer Sheet for the answer yo...
A.
Some consumers who also estimate the value of the good at more than the marginal cost of production.
B.
Some consumers who estimate the price of the good at more than the marginal cost of the production.
C.
Some consumers who have a high opinion of the good at more than the marginal cost of the production.
D.
Some consumers who estimate the worth of the good at more than the marginal cost of the production.
相关题目：