问题 读图填空题

观察右边桃花的结构示意图,请据图分析回答下列问题。

(1)该图除了表示桃花的结构外,还可表示桃花的         过程。花谢以后要结桃子,还要经历的另一个重要生理过程是      

(2)图中序号3、4、5所示结构共同组成           。

(3)我们平时所吃的桃子,其食用部分是由图中的[  ]           发育而来的。

(4)桃树体细胞的染色体数目是16条,那么图中【1】结构内的花粉的染色体数目是   条。

(5)假设该桃树控制花色的基因组成为Rr(R为红色,r为白色),请你判断图中【7】所携带的基因     ,该花经过发育后所形成的种子长成的植株,再开出花的颜色可能是       。花色在遗传学上称为性状,红花与白花在遗传学上称为                

答案

(1)传粉 (双)受精  (2)雌蕊 (3)[3]子房壁 (4)8 (5)R或r 红色或白色 相对性状 

花粉从花药散落到雌蕊柱头上的过程叫做传粉,结出果实前有两个重要的生理过程:传粉与受精;雌蕊由柱头、花柱和子房组成;平常吃的桃子的食用部分是果皮,是由子房壁发育成的;生殖细胞中的染色体是体细胞中的一半;花色的基因组成为Rr,那么将会提供两种基因,一是R,一是r,开出的花的基因组成可能是AA、Aa、aa,所以花色可能是红色,也有可能是白色,生物学上把同种生物同一性状的不同表现形式称为相对性状。

阅读理解

阅读理解。

     After years of hearing drivers complain about scratches (划痕) on their cars, Japan's Nissan Motor

Company has officially announced the next big thing-a paint that not only resists scratches and scrapes,

but actually repairs itself within a few days.

     The new material, developed by Nippon Paint Company, contains an elastic rubbery-like resin (弹性树

脂) that is able to heal minor (较小的) marks caused by car wash equipment, parking lot encounters, road

debris (石头碎片) or even on-purpose destruction.

     The automaker admits its results vary depending on the temperature and the depth of the damage, but

adds this is the only paint like it in the world, and tests prove it works.

     Minor scratches, the most common type, are said to slowly fade over about a week. And once they're

gone, there is no trace (痕迹) that they were ever there.

     The special paint is said to last for at least three years after it is first applied, but there is no word yet

on whether more can be added after that period.

     Nissan claims car washes are the worst offenders for this type of damage, accounting for at least 80

percent of all incidents.

     But the complete auto-healing won't come without scratching your wallet. The vehicle maker notes

the special paint adds about $100 US to the price of a car.

     It plans to use its new chemical mixture only on its X-Trail SUVs in Japan for now, as it looks for a

more widespread presentation. And while plans to offer the feature overseas haven't been made yet, if it's

a hit there, you can be almost sure market forces will drive it to these shores, as well.

1. From the article, we can find that ______.

A. the paint has already been used on cars by now

B. it beats other products of its kind in its lengthy effect

C. car damage is mainly caused by scratches and scrapes

D. marketing this paint in Europe is not under way

2. The paint used on cars can ______.

A. last 3 years before it is re-applied again

B. fade only in a few days

C. help to heal minor paint damage

D. reduce car scrape incidents to 20 percent

3. What does the underlined part refer to?

A. certain models of Nissan

B. name for one kind of paint

C. somewhere in Japan

D. a word standing for a car-dealer store

4. What can be inferred from the article?

A. The paint was developed by Nissan Motor Company.

B. The paint might work better in summer than in winter.

C. The mark on the car could disappear as soon as the paint is applied.

D. The paint is very popular in Japan.

单项选择题