下列关于植物传粉、受精和发育的说法中，不正确的是（） A_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

下列关于植物传粉、受精和发育的说法中，不正确的是（　　）

A．花粉散落（传粉）到雌蕊柱头上的过程称为传粉

B．果皮是由子房壁发育成的

C．胚是由子房发育成的

D．种子是由胚珠发育成的

答案

当一朵花开发之后必须完成传粉与受精，才能结出果实和种子，传粉是指雄蕊的花粉落到雌蕊的柱头上的过程．受精是指精子和卵细胞结合成受精卵的过程．一般当花完成传粉与受精后只有子房进一步发育为果实．果实与种子的形成图如下：

可见，传粉受精完成以后，子房发育成果实，子房壁发育成果皮，胚珠发育成种子，珠被发育成种皮，受精卵发育成胚，受精极核发育成胚乳，故C符合题意．

故选：C

单项选择题

关于松果体解剖的描述，错误的是（）

A、松果体属于灰白质兼有结构

B、松果体位于四叠体池内，可能是一个重要的内分泌腺体。

C、松果体柄分为上脚和下脚，中间夹着松果体隐窝

D、正常人5%的松果体为囊性，其大小差异较大

E、正常松果体增强扫描强化不明显。

完形填空

A daughter complained to her father about her life and how things were so hard for her. She was      of fighting and struggling. It seemed as one problem was solved a new one appeared.
Her father, a cook, took her to the     . He filled three pots with      and placed each on a high fire. In one he placed carrots, in the second     , and in the last ground(磨碎的) coffee beans.
The daughter      waited, wondering what he was doing. In about twenty minutes he      the fire. He fished the carrots out and placed them in a bowl. He      the eggs out and placed them in a bowl. Then he poured the      out and placed it in a cup.      to her he asked, "Darling, what do you see?"
"Carrots, eggs, and coffee." she replied.
He brought her closer and asked her to      the carrots. She did and said that they were     . He then asked her to take an egg and      it. After pulling off the     , she observed the hard-boiled egg. Finally, he asked her to drink the coffee. She smiled, as she      its rich aroma(芳香).
"What does it     , Father?" she asked.
He explained that each of them had      the same adversity(逆境), boiling water, but each reacted     . The carrot went in strong and hard but then it turned softened and weak. The egg had been fragile(易碎的), but at last its inside became     . The ground coffee beans were unique, however, after they were in the boiling water, they had      the water.
"Which are you?" he asked his daughter.
When adversity knocks on your door, how do you     ? Are you a carrot, an egg, or a coffee bean?

C．living room

D．impatiently

C．differently

D．successfully