问题 实验题

某研究小组探究避光条件下生长素浓度对燕麦胚芽鞘生长的影响。胚芽鞘去顶静置一段时间后,将含有一定浓度生长素的琼脂块分别放置在不同的去顶胚芽鞘一侧,一段时间后测量并记录弯曲角度(α)。下图为实验示意图。

(1)α的范围为_______________。

(2)若想在细胞水平上证明生长素对胚芽鞘生长的影响,可以取弯曲处作____(填“纵”或“横”)向切割后制成装片,用显微镜观察、测量两侧细胞平均长度,作出比较。

(3)预期的实验结果是:__________。

(4)实验结论是:生长素促进细胞生长的原理是生长素能够_______________。

答案

(1)0<α≤90

(2)纵

(3)左侧细胞平均长度比右侧细胞长

(4)促进细胞伸长

实验题
阅读理解

阅读理解。

     Camping wild is a wonderful way to experience the natural world and, at its best, it makes little environmental

influence. But with increasing numbers of people wanting to escape into the wilderness, it is becoming more and

more important to camp unobtrusively (不引人注目的) and leave no mark.

     Wild camping is not permitted in many places, particularly in crowded lowland Britain. Wherever you are,

find out about organizations responsible for managing wild spaces, and contact them to find out their policy on

camping and shelter building. For example, it is fine to camp wild in remote parts of Scotland, but in England

you must ask the landowner's permission, except in national parks.

     Camping is about having relaxation, sleeping outdoors, experiencing bad weather, and making do without

modern conveniences. A busy, fully-equipped campsite (野营地) seems to go against this, so seek out smaller,

more remote places with easy access to open spaces and perhaps beaches. Better still, find a campsite with no

road access: Walking in makes a real adventure.

     Finding the right spot to camp is the first step to guaranteeing a good night's sleep. Choose a campsite with

privacy and minimum influence on others and the environment. Try to use an area where people have obviously

camped before rather than creating a new spot. When camping in woodland, avoid standing dead trees. Which

may fall on a windy night. Avoid animal runs and caves, and possible homes of biting insects. Make sure you

have most protection on the windward side. If you make a fire, do so downwind of your shelter. Always

consider what influence you might have on the nature word. Avoid damaging plants. A good campsite is found,

not made-changing it should be unnecessary.

1. You needn't ask for permission when camping in _____.

A. national parks in England

B. most parts of Scotland

C. crowded lowland Britain

D. most parts of England

2. The author thinks that a good campsite is one _____.

A. with easy access

B. used previously

C. with modern conveniences

D. far away from beaches

3. The last paragraph mainly deals with _____.

A. protecting animals

B. building a campfire

C. camping in woodland

D. finding a campsite with privacy

4. The passage is mainly about _____.

A. the protection of campsites

B. the importance of wild camping

C. the human influence on campsites

D. the dos and don'ts of wild camping