问题 填空题

如图是某校生物兴趣小组对农田生态系统做过调查后绘制的食物网简图.请根据图来回答下列问题:

(1)在农田生态系统中,鼠与昆虫之间是______关系.

(2)如果用于灌溉农田的水中含有难以分解的有毒物质,体内有毒物质积累最多的生物是______.

(3)收秋季节,有不少农民在田里焚烧农作物秸秆,造成环境污染.针对这一现象,该小组向有关部门建议,利用秸秆生产“再生纤维共混膜”,以减少塑料地膜带来的“白色污染”.“再生纤维共混膜”在土壤中1-2个月就会被分解掉,分解该“地膜”的生物被称为生态系统中的______.

答案

(1)在该农田生态系统中,鼠与昆虫之间并不存在捕食关系,但它们会争夺共同的食物--植物,所以鼠与昆虫之间是竞争关系.

(2)我们知道有毒物质会在生物体内进行生物富集,所以生物的营养级别越高体内的有毒物质就越高.故体内有毒物质积累最多的生物是蛇.

(3)分解者的作用是把复杂有机物分解成简单无机物,促进物质的循环.所以分解该“地膜”的生物被称为生态系统中的分解者.

故答案为:(1)竞争   (2)蛇   (3)分解者

单项选择题
单项选择题

In the next century we’ll be able to alter our DNA radically, encoding our visions and vanities while concocting new life-forms. When Dr. Frankenstein made his monster, he wrestled with the moral issue of whether he should allow it to reproduce, "Had I the right, for my own benefit, to inflict the curse upon everlasting generations" Will such questions require us to develop new moral philosophies

Probably not. Instead, we’ll reach again for a time-tested moral concept, one sometimes called the Golden Rule and which Kant, the millennium’s most prudent moralist, conjured up into a categorical imperative: Do unto others as you would have them do unto you; treat each person as an individual rather than as a means to some end.

Under this moral precept we should recoil at human cloning, because it inevitably entails using humans as means to other humans’ ends and valuing them as copies of others we loved or as collections of body parts, not as individuals in their own right. We should also draw a line, however fuzzy, that would permit using genetic engineering to cure diseases and disabilities but not to change the personal attributes that make someone an individual (IQ, physical appearance, gender and sexuality).

The biotech age will also give us more reason to guard our personal privacy. Aldous Huxley in Brave New World, got it wrong: rather than centralizing power in the hands of the state, DNA technology has empowered individuals and families. But the state will have an important role, making sure that no one, including insurance companies, can look at our genetic data without our permission or use it to discriminate against us.

Then we can get ready for the breakthroughs that could come at the end of the next century and the technology is comparable to mapping our genes: plotting the 10 billion or more neurons of our brain. With that information we might someday be able to create artificial intelligences that think and experience consciousness in ways that are indistinguishable from a human brain. Eventually we might be able to replicate our own minds in a "dry-ware" machine, so that we could live on without the "wet-ware" of a biological brain and body. The 20th century’s revolution in infotechnology will thereby merge with the 21st century’s revolution in biotechnology. But this is science fiction. Let’s turn the page now and get back to real science.

According to the last paragraph, "dry-ware" is to "wet-ware" as()

A. "collective" to "individual"

B. "fictional" to "factual"

C. "mechanical" to "biological"

D. "illegal" to "immoral"