题干

甲、乙是染色体数目相同的两种二倍体药用植物,甲含有效成分A,乙含有效成分B.某研究小组拟培育同时含有A和B的新型药用植物.

回答下列问题:

(1)为了培育该新型药用植物,可取甲和乙的叶片,先用纤维素酶和果胶酶去除____ ,获得具有活力的原生质体,再用化学诱导剂____ 诱导二者融合.形成的融合细胞进一步培养形成愈伤组织,然后经过____ 形成完整的杂种植株.这种培育技术称为____ .细胞变为植株体现了____ 原理.

(2)这种杂种植株可通过制作人工种子的方法来大量繁殖.经植物组织培养得到的____ 等材料用人工薄膜包装后可得到人工种子.

(3)上述这种技术和动物细胞杂交技术在诱导细胞融合时的不同是动物细胞杂交技术可____ 融合.

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    Garbage(垃圾) Island

    You can't see it from the air. It's almost impossible to see from a ship. But somewhere in the North Pacific is a huge island of garbage, just below the water surface.

    What is the island made of?

    The garbage island is not an island, but a collection of millions of plastic and other objects. The water movements of Pacific Ocean bring the objects together and cause them to go around in a big circle.

    Charles Moore found it in 1997 and named it “the Great Pacific Garbage Patch” .

    Where does all the plastic come from?

    Much of the garbage comes from everyday objects, such as shopping bags and water bottles. Some of these objects finally reach the ocean. Garbage from the western coast of North America takes about six years to reach it. Objects from East Asia take about a year. Other garbage comes from ships passing through the area.

    Is the Garbage Patch dangerous?

    The larger pieces of garbage are a problem for wildlife. For example, sea turtles(海龟)and seabirds often think the plastic is their food. They eat the plastic and die.

    In addition, the plastic stops sunlight from reaching deeper water. Without sunlight, very small sea animals die. Then, there is less food for larger fish to eat.

    What can we do to help stop it?

    Cleaning up the island isn't easy. But we can make people realize the problem. One environmentalist(环保主义者), David de Rothschild, is sailing around the world in boat made of plastic bottles to teach people about the problem of garbage in the sea.

    Another idea is that we can recycle the plastic garbage. Environmental engineer Cesar Harada is building a robot that collects pieces of plastic. Harada hopes to use his robot in the Pacific. Harada also has a website for reporting environmental problems. He says, “I hope everybody can become an environmental activist.”