推广优良苹果树品种，最常用的方式是[]A．无性生殖中的扦插B．无性生殖中的嫁接C．有性生殖中的种子繁殖D．无性生殖中的出芽生殖-八年级生物

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• 植物园里的几株国家二级保护植物——蕨类植物桫椤感染了植物病毒，为了培育出大量无病毒的桫椤植株，你认为应采取的方法是[]A．用带毒植株的种子培养后代B．用带毒植株无明显症状-八年级生物
• 在嫁接植物时，成功的关键是：[]A．选好砧木B．应使砧木和接穗的树皮连在一起C．选好接穗D．应使砧木和接穗的形成层紧密结合-八年级生物
• Last year John earned________his brother did，who has a better position in a bigger company.A．twice a
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• 图1是桃花的结构模式图，图2是桃的果实示意图。请分析回答：（1）从构成生物体的结构层次上分析，花和果实都属于________。（2）图中[⑤]和[⑥]组成的结构叫________，结构[④]是___-
• 分析回答下列有关植物扦插和嫁接的问题：（1）再用植物扦插繁殖时，一般茎段保留两个节，茎段上方的切口是________，下方的切口是______，对上一个节上的叶要_________，对下一-七年级生物
• 现有一种非常珍贵而又很难用种子繁殖的苗木，若让它在短时间内大量繁殖，可以采用的方法是[]A．组织培养B．扦插C．嫁接D．有性生殖-七年级生物
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• 把紫背天葵的茎段处理后，埋入土中，一段时间能长出新的植株，所采用的这种处理技术是压条。[]-八年级生物
• Dream of the Red Chamber is ________worth ________because we can learn alot about the noble familie
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• 下列植物中，常用扦插繁殖的是[]A．甘薯和银杉B．葡萄和月季C．梨和苹果D．菊花和金鱼藻-八年级生物
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• 为使水蜜桃保持其优良性状，果农们常采用的繁殖方法和为了在短时间内生产出大批无病毒兰花苗，科学家们常采用的繁殖方法依次是[]A．压条、植物组织培养B．嫁接、植物组织培养C-八年级生物
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