“植物体的组织可以分成表皮、基本组织和维管组织”这一概念适用于：

1. A.
   蕨类植物与苔藓植物
2. B.
   被子植物与裸子植物
3. C.
   蕨类植物与种子植物
4. D.
   各类高等植物

就植树节这一天的植树活动写一篇简短的日记。（不少于60个单词，注意格式。）

提示: 1. 穿旧衣服；2. 早餐后乘车去南山；3. 挖坑，种树，浇水，每人种树三棵；4. 12点结束；5. 感想

某一种植物生活史中出现种子，但不出现花被，该植物属于：

1. A.
   被子植物
2. B.
   裸子植物
3. C.
   双子叶植物
4. D.
   单子叶植物
   
5. E.
   以上选择均不可靠

利用植物体上的活细胞，在无菌条件下，培养成试管苗，再移植到土壤中发育成完整的植物体。这种技术叫做

1. A.
   无土栽培
2. B.
   组织培养
3. C.
   植物细胞的全能性
4. D.
   细胞分化

Britain’s seed(种子) bank, the only one in the world aiming to collect all of the planet’s wild plant species, has reached its goal of banking 10 percent by 2010.
The Millennium Seed Bank Project, run by Kew Gardens—one of the oldest botanical(植物的)  gardens—will officially place the 24,200th species on Thursday, a pink, wild banana from China.
More than 50 countries are now on board with Kew's giant task but vast places of the globe, including India and Brazil, still need to join in and donate seeds, director Paul Smith said.                                                                                                                                                            
The seed bank is one of the largest and most diverse(多样的) in the world with more than 1.5 billion seeds. Its goal is to help protect the planet’s bio-diversity during a time of climate change.
The wild banana seed is under threat of extinction(灭绝) in southwest China from agricultural development. It is a vital food source for Asian elephants and important for growing bananas for human eating.
Stored at minus-20 degrees centigrade, so they can last for thousands of years, the seeds await the day that scientists hope never comes—when the species no longer exist in the wild.
It is a race against time, Smith said, because in the last ten years alone, 20 plants held in the bank have already been wiped out in the wild. He estimates that between a third and a quarter will become extinct this century.
"It is pressing and it is happening now. An area, the size of England, is cleared of primary vegetation（植被）every year." Smith said.
Because most of the world's food and medicines come from nature, protecting wild plant species is quite important, scientists say. There are already many other seed banks safeguarding food crops, which only account for 0.6 percent of plant diversity.
For Kew's next goal—to collect a quarter of wild varieties（种类）by 2020—the botanists need 10 million pounds a year, or a further 100 million pounds on top of the 40 million they have already been granted.
【小题1】What’s the final purpose of the Britain’s seed bank?