问题 解答题

阅读下列资料并分析回答问题:

资料一:蚯蚓和小白鼠都是昼伏夜出的动物,它们都能经过训练形成一种新的行为.某兴趣小组训练蚯蚓和小白鼠走“T”形迷宫获取食物的学习行为.结果表明,蚯蚓大约经过200次尝试,才能学会直接爬向食物.

资料二:把一块牛肉分成大小相同的三块,分别放在相同的甲、乙、丙三个广口瓶中,然后作如下处理和保存:

分组
处理方法灭菌灭菌后接种细菌不作任何处理
保存方式无菌环境无菌环境自然条件
根据资料一回答:

(1)从行为的发生(获得途径)看,蚯蚓和小白鼠昼伏夜出的行为属于______.

(2)蚯蚓与小白鼠相比,学习能力较强的是______.

(3)兴趣小组训练蚯蚓和小白鼠走“T”形迷宫,采用的研究方法是______.

根据资料二回答:

(4)若要证明“细菌能分解有机物“,则只能选择甲组与______组进行对照实验,原因是______.

(5)甲、乙、丙三组中,牛肉块会腐烂的有______.

答案

(1)根据动物行为获得的途径,动物行为可分为先天性行为和后天性学习行为.蚯蚓和小白鼠昼伏夜出是生来就有的,是由动物体内的遗传物质所决定的先天性行为.

(2)学习行为是指在遗传因素的基础上,通过环境因素的作用,由生活经验和学习而获得的行为.动物越高等,学习能力越强,适应环境能力也就越强.动物越低等,学习能力就越弱,学会某种行为中“尝试”和“错误”的次数就越多.蚯蚓与小白鼠相比低等多,所以学习能力较强的是小白鼠.

(3)实验法是利用特定的器具和材料,通过有目的、有步骤的实验操作和观察、记录分析,发现或验证科学结论.兴趣小组训练蚯蚓和小白鼠走“T”形迷宫,采用的研究方法是实验法.

(4)实验要证明“细菌能分解有机物”,形成对照试验时应有唯一变量:是否接种细菌,其它量相同.实验中甲、乙两组只存在单一变量--是否接种细菌,所以甲、乙两组可以用于探究“细菌能分解有机物”.

(5)乙、丙培养皿中有微生物繁殖所需要的条件,即温度、水分、有机物,而甲培养皿由于经过灭菌,没有微生物,所以牛肉块会腐烂的有乙组、丙组.

故答案为:(1)先天性(或本能)行为

(2)小白鼠

(3)实验法

(4)乙;甲、乙两组只存在单一变量

(5)乙组、丙组

单项选择题
单项选择题

Every second in the United States alone, more than 250 animals are slaughtered for food, adding up to more than 8 billion animals each year. Reducing the amount of meat in one’s diet is nutritionally, environmentally, and ethically beneficial.

People who eat meat usually have weaker immune systems compared to those of vegetarians. Meat has been directly linked to diabetes, obesity, arthritis, and many other illnesses. Furthermore, meat-eaters are at a higher risk for diseases, including cancer, and they are more likely to die from these diseases. Critics say that a meatless diet does not provide enough nutrients, especially protein and iron. Actually, according to A Teen’s Guide to Going Vegetarian, by Judy Krizmanic, protein is found in almost every food, and iron appears in many vegetables. Getting enough nutrients in a meat-reduced diet should not be difficult. A 1988 study found that some of the highest pesticide residues appear in meat and eggs. Diets including more fruits and vegetables will only make people healthier.

Some skeptics believe that there will be a shortage of food if animals are not eaten. In fact, the opposite is true. More than 80% of the corn and 95% of the oats grown in the US are fed to livestock. The world’s cattle alone consume enough food to equal the caloric needs of 8.7 billion people, more than the entire human population. One half of the water used in the Unites States also goes to livestock; 2.50 gallons of water produces only 1 pound of beef. If people eat less meat and more plants, the amount of available food will increase.

Many people become vegetarians because they feel that eating animals is unethical. 90% of these animals are raised in confinement. Chickens and other birds have only about half. a square foot of space each, and since they are raised so close together, a hot blade is used to cut off their beaks to prevent them from pecking each other to death. Likewise, pigs that are repressed will bite each other’s tails, so both their teeth and tails are removed as soon as they are born.

Eating animals is hazardous in numerous ways. Even a slight reduction in meat intake is better than nothing at all. Consuming less meat is beneficial to the health of animals, the health of people, and to the health of the world.

Which of the following would be the best title for the text()

A. The Advantages of Eating Less Meat

B. Why People Become Vegetarian

C. Environment and Meatless Diet

D.Saving Cattle and Chickens