问题 探究题

下表为“探究种子萌发的外界条件”的实验设计,请根据表中信息,回答下列问题

(1)如果用培养皿A与B进行对照实验,所探究的问题是种子的萌发是否需要适宜的_____?

(2)若需探究水分对种子萌发的影响,应选用_____和______两组培养皿做对照实验。

(3)如果用培养皿A(有空气)和D(无空气)进行对照实验,结果发现A组种子能正常萌发,D组种子不能萌发,这说明种子的萌发需要__________。

(4)若要探究光照对该种子的萌发有无影响,请完成下列实验方案的设计和结果分析。

第一步:在培养皿底部铺上滤纸,并加入适量的水,然后取等量的两份种子分别放人两组培养皿中(温度控制在20℃);

第二步:将一组培养皿置于______的环境中,另一组置于黑暗的环境中,培养一段时间。

结果分析:如果两组培养皿中种子萌发的结果基本相同,则说明光照对该种子的萌发___

(填“没有”或“有”)影响。

答案

(1)温度    (2)A  C    (3)空气(或氧气)     (4)光照 没有

要研究某一因素对种子萌发的影响,应该控制该因素为唯一变量,其他因素都不变。A和B的唯一变量是温度, A和C的唯一变量是水分,A和D的唯一变量是空气。最后探究光照对种子萌发的影响中,第二步应将一组放在光照环境中,另一组放在黑暗环境中,种子萌发的营养物质来自自身贮存,不是光合作用产生,所以光照无影响。

阅读理解

阅读理解。

     Ed Viesturs grew up in Rockford, Illinois, where the tallest thing on the horizon was the water tower.

But on Thursday, Viesturs became the only American to climb to the top of the world's 14 highest mountains.

     His last hike was up Mount Annapurna, in Asia's snowcapped Himalayas. At 26,545 feet, its peak is the

10th highest in the world. It is the mountain that inspired him to start climbing.

     "It tends to be the trickiest, the most dangerous," said Viesturs. "There's no simple way to climb it. There

are threatening avalanches (雪崩) and ice falls that protect the mountain."

     In high school, Viesturs read French climber Maurice Herzog's tale of climbing the icy Annapurna. Herzog's

story was of frostbite (冻伤) and difficulty and near-death experiences. Viesturs was hooked right away.

     Viesturs got his start on Washington's Mount Rainier in 1977, guiding hikes in the summer. Fifteen years

ago, he set out to walk up to the world's highest peaks. Finally, he's done.

     The pioneering climber talks about mountains as if they were living creatures that should be treated with

respect. "You have to use all of your senses, all of your abilities to see if the mountain will let you climb it,"

said Viesturs. "If we have the patience and the respect, and if we're here at the right time, under the right

circumstances, they allow us to go up, and allow us to come down."

     What's next for a man who can't stop climbing? "I'm going to hug my wife and kids and kind of kick back

and enjoy the summer," says Viesturs. But for a man who's climbed the world's 14 tallest mountains, he will

probably soon set off on yet another adventure.

1. What record has Ed Viesturs set? [ ]

A. He has succeeded in climbing to the world's 14th highest mountain.

B. He has been to the top of the world's 14 highest mountains.

C. He has become the first to climb to the height of 26,545feet.

D. He has become the first man to climb to the top of 14 highest mountains in the world.

2. The underlined word "hooked" in Paragraph 4 can be replaced by "_____". [ ]

A. frightened

B. discouraged

C. interested

D. upset

3. The author used Viestures' words in Paragraph 6 to support a view that _____. [ ]

A. mountain climbing is a dangerous sport

B. mountains should be regarded as living creatures

C. mountain climbing needs more skills than physical energy

D. those who like mountain climbing won't stop climbing

4. What's the next probably plan of Viestures? [ ]

A. Stopping climbing and staying with his family.

B. Climbing to the top of the world's 14 tallest mountains again.

C. Climbing another one of the highest mountains.

D. Writing down the experiences about his adventure.

问答题 简答题