问题 解答题

如图是与桃树有关的示意图或结构模式图,请据图回答有关问题.([]在内填序号,______上写文字)

(1)桃子果实中常被人们食用的部位是由图甲中[______]______发育而来的.

(2)图乙中的部位[______]______可说明桃树属于被子植物.桃子的蟠桃果形与圆桃果形互为一对相对性状(由等位基因H、h控制),如果蟠桃果形对圆桃果形为显性,那么蟠桃果形的基因组成可能是______.

(3)桃花花瓣有红、粉红、白等多种颜色,决定花瓣颜色的物质主要存在于图丙的[______]______中.

(4)有一果农发现他栽的桃树中,有一株桃树上结出的果实特别大而甜,为提高桃树的品质,该果农进行了图丁所示的技术处理,图丁中[______]______属于该植物的一部分.

答案

(1)桃子果实中常被人们食用的部位属于果皮,由③子房壁发育而成.

(2)被子植物又叫绿色开花植物,主要特征是:胚珠外有子房壁包被,种子有果皮包被,图乙中的部位[②]种子可说明桃树属于被子植物.当控制某一性状的一对基因一个是显性、一个是隐性时,表现为显性性状;当控制某一性状的基因都是显性时,表现为显性性状;当控制某一性状的基因都是隐性时,表现为隐性性状.如果H是显性基因,h是隐性基因,则显性性状的基因组成是HH或Hh.

(3)细胞质里有④液泡,液泡内的细胞液中溶解着多种物质.因此决定桃花颜色的物质都存在于细胞液中.

(4)图丁中①接穗,②砧木,有一株桃树上结出的果实特别大而甜,为提高桃树的品质,该果农进行了图丁所示的嫁接,图丁中①接穗属于该植物的一部分.

故答案为:(1)③;子房壁;

(2)①;果皮;HH或Hh;

(3)④;液泡;

(4)①;接穗

多项选择题
单项选择题

The conception of God and nature and of the relation of man to both provided the 18th- century philosophers with their faith in the worth and dignity of the individual man and the efficacy of human reason. The 18th century was the moment in history when men experienced the first flush and freshness of the idea that man is master of his own fate; the moment in history, also, when this emancipating idea, not yet brought to the harsh test of experience, could be accepted with unclouded optimism.
Never had the nature seemed less mysterious, more simply constructed, more open and visible and eager to yield its secrets to common-sense questions. Never had the nature of man seemed less perverse, or the intelligence and will of men more pliable (yielding) to rational persuasion. Never had social and political evils seemed so wholly the result of ignorance and superstition, or so easily corrected by the spread of knowledge and the construction of social institutions on a rational plan.
The first task of political science was to discover the natural rights of man, the second to devise the form of government best suited to secure them. And for accomplishing this high task, for creating and maintaining a society founded on justice and equality, the essential freedom was freedom of the mind.

In the next paragraph(not reproduced here), the author will most probably write on ______ .

A.development of medical equipment for hospitals

B.meticulous plans on establishment of ideal governments

C.surgery experts that help to cure mental diseases

D.philosophers whose works liberate human minds