Предмет: Биология, автор: Foreverinlove

Биология,помогите
Тема:размножение

Приложения:

Ответы

Автор ответа: anastasiya260503
0

  1. Суть двойного оплодотворения у цветковых растений заключается в том, что  в нём участвуют два спермия. Один из них оплодотворяет яйцеклетку и образуется зигота. Второй спермий сливается с центральной клеткой, из которой развивается запасающая ткань (эндосперм).
2. Увеличивает разнообразие вида

3. Пыльца- мужское

Яйцеклетка- женское

Пестик- женское

Семязачаток- женское

Спермий- мужское

Завязь- женское

Тычинка- мужское

Рыльце- женское

Удачи)))

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III. ВЫБЕРИТЕ ПРАВИЛЬНЫЙ ВАРИАНТ (20 баллов).

1. … you skate when you were six?

a) could b) can c) may

2. You … sleep at lectures. It’s impolite.

a) mustn’t b) do not have to c) can

3. The guide … meet the group and take them to the hotel yesterday.
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4. … I ask you a question?

a) Should b) Can c) Must

5. It was Sunday and I … to get up early.

a) mustn’t b) didn’t have c) needn’t

6. He … see nothing without his glasses.

a) can b) can’t c) couldn’t

7. .– I’ve got a very bad cold.

– I think you … go to bed.

a) would b) are able to c) should

8. She is a hard working student, so she … pass her exam.

a) able to b) can to c) should

9. Mr. Lane isn’t in his office. He … be on holiday.

a) should b) must c) has to

10. Tom can play football very well, but today he … play it. He has hurt his leg.

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11. I … drive now but next year I … drive.

a) can’t; am able to b) couldn’t; will be able to c) can’t; will be able to

12. – Schoolchildren in India … wear uniforms.

a) has to b) can to c) have to

13. – Is the baby sick?

– It’s possible. He looks pale and he isn’t eating much. I … to call the doctor

later.

a) will have b) had to c) have to

14. … you help me carry this suitcase, please?

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15. I was so surprised that I … say a word.

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16. I haven’t got any money. I … go to the bank.

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17. When we went into the house we … smell something burning.

a) could b) were able to c) could to

18. The babysitter was ill and Ellen … look after the child herself.

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19. The boy fell into the river but we … rescue him.

a) was able to b) were able to c) can

20. When I was young I … sing very well.

a) can b) could c) am able to
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