问题 解答题

如图为花的结构简图,请据图填空:

(1)写出花的各部分的名称.

①______,②______,

③______,④______,

⑤______,⑥______,

⑦______,⑧______,

⑨______,⑩______.

(2)在观察花的结构时,用镊子由外向内依次摘下是______、______、和______,最后看到的是雌蕊.

(3)在花的结构中,______和______是花的主要部分,因为它们与______和______的形成有关.

(4)在果实形成过程中,子房壁逐步发育成______,位于子房壁中的胚珠发育成______,______发育成胚,整个子房发育成______.

答案

(1)由图可知:1是花药、2是花丝、3是雄蕊、4是柱头、5是花柱、6是子房、7是雌蕊、8是花瓣、9是萼片、10是花托、11是花梗

(2)在观察花的结构时,要用镊子从外向内依次摘下萼片、花瓣、雄蕊和雌蕊.

(3)在花的结构中,雄蕊和雌蕊与果实和种子的形成有直接关系. 雄蕊可以产生精子,雌蕊中有子房和胚珠,胚珠内有卵细胞.果实和种子的形成必须要经过传粉和受精两个生理过程,没有雄蕊和雌蕊就不能完成这两个生理过程,也不能形成果实和种子.

(4)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.

故答案为:(1)1是花药;2是花丝;3是雄蕊;4是柱头;5是花柱;6是子房;7是雌蕊;8是花瓣;9是萼片;10是花托.(2)萼片;花瓣;雄蕊.(3)雄蕊;雌蕊;果实;种子.(4)果皮;种子;受精卵;果实.

阅读理解

阅读理解。

     It's hard to make friends if you stay at home alone all the time. Be outgoing, get out of the house and do things with

other people. It's easier to make friends when you follow these:

     Show people what you are good at. Talk about the things you like and you do best. People will be interested in you

if there is something interesting.

     Look people in the eye(正视) when talking with them. That way,  they'll find it easier to talk to you,   or people may

think you're not interested in them and stop being interested in you.

     Be a good listener. Let people talk about themselves before talking about yourself. Ask lots of questions. Show an

interest in their answers.

     Make friends with the people you really like, not just with those who are easy to meet. Be friendly to people.   That

way, you'll have a bigger group of people to choose and more chances(机会)for making friends.

1. If you _______, you will have more friends.

A. get out and talk to people      

B. stay at home   

C. like talking                

D. are good at asking questions

2. If you look right and left when people talk to you, they may think you are_______.

A. looking for something        

B. worrying about something

C. happy to see them          

D. not interested in them

3. Linda is talkative(健谈的). But she doesn't like listening to other people. Linda should_______.

A. show off(炫耀) to other people    

B. be a better listener

C. look people in the eye            

D. make friends with other kinds of people

4. You should be _______ if you want to have more chances for making friends.

A. cool    

B. more careful    

C. more friendly    

D. hard-working

5. The main idea of this passage is _______.

A. that it is hard to make friends    

B. about how to make friends 

C. about not talking about yourself  

D. about being friendly to others

选择题