人工营养生殖的常用方法有：___________、___________和________等。-八年级生物

更多内容推荐

• 要使一棵柿子树上结出两个品种的柿子，我们应采用的方法是[]A．压条B．扦插C．嫁接D．种子繁殖-八年级生物
• 繁殖优良品种的果树花卉时，为了保持这种品种的优良性状，不宜采用的方法是[]A．种子繁殖B．扦插繁殖C．压条繁殖D．嫁接繁殖-八年级生物
• 甘薯、葡萄、菊、月季等植物的栽培，常用的无性生殖方法是_______。-八年级生物
• 园丁们培育月季花常用的技术为[]A．组织培养B．扦插C．种子繁殖D．无土栽培-八年级生物
• 用一红色月季枝条做接穗，黄色月季枝条做砧木进行嫁接，嫁接上的枝条将开的花是[]A．橙色B．只有黄色C．只有红色D．既有红色又有黄色-八年级生物
• 随着科学技术的迅猛发展，植物组织培养技术已广泛应用于生产实践中。这一技术[]A．可防止植物病毒的危害，提高农业生产效率B．可培育抗病毒的植物新品种C．可有目的地改变母体的-八年级生物
• 根据所学知识，回答下列问题：（1）请写出绿色植物进行光合作用的反应式___________________。（2）“妃子笑”是优良荔枝品种，为了保持其优良性状，最好用__________方法繁殖。（3
• If you listen to English programs every day, I’m sure you’ll _______ make progress in English.A．fre
• 直供上海世博会的蔬菜有六成来自山东。按照世博会的要求，所有专供蔬菜都要达到绿色食品标准。请分析回答下列问题：（1）绿色食品是经权威机构认定并使用专门标志的安全、优质、-八年级生物
• 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
• Scientists said that the winter of 2011 was _____ cold, and in fact it was much colder than predicte
• 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
• (2014·山东实验中学二模)You can never be________careful，the road is icy and slippery.A．veryB．tooC．quiteD．rath
• As he works in a remote area, he visits his parents only _______ .A．anxiouslyB．occasionallyC．urgentl
• 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
• (2013·沈阳二中模拟)She devoted herself________to her research and it earned her a good reputation in her f
• 梨、桃等的栽培通常用来繁育优良品种。[]A．嫁接B．种子C．扦插D．压条-八年级生物
• Maggie has been fortunate to find a job she loves; __________，she gets well paid for it. A．sooner or
• The central government plans to build a Taiwan community managed _____by Taiwan people --- and it wi
• We may find that learning a foreign language does not have to be________learning our mother tongue，
• 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
• Drive ________until you come to the small town，which lies about 100 kilometers ________ London.A．no
• The new bridge is ________ the one built last year. A．three times width ofB．three times that of C．th
• There is not much time left，but________we must get there on time.A．somehowB．somewhatC．howeverD．anyho
• She sells second-hand articles at reasonably fair prices from 10 to 50 dollars ____ in her shop.A．so
• She devoted herself ________to her research and it earned her a good reputation in her field.A．stro
• 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
• It was ________ that the tourists wanted to spend more time taking pictures outdoors.A．so fine weath
• —Are you feeling ________？—Yes.I'm fine now.A．any wellB．any betterC．quite goodD．quite better-高
• After two years' research，we now have a ________ better understanding of the disease.(2013·全国Ⅱ)
• (2013·浙江，18) If what your friend comes up with surprises you，don't reject it immediately.______
• —Is Mr. Wang in?—Sorry，he ________ lives here. He has moved.A．no moreB．not moreC．no longerD．not long
• The science lab being built in our school is ____________ the former one.A．twice as big asB．twice mo
• 在一棵苹果树上可以结出红富士、金帅、小国光三个品种的苹果，采用的繁殖方式是[]A．种子繁殖B．扦插C．压条D．嫁接-八年级生物
• It sounded like something was wrong with the car’s engine then, ______ they would have carried on t
• I cannot thank you ________ much. I might never have been admitted to such a famous university but
• ．Broadly speaking, I would agree with Shirly, though not________.A．widelyB．thoroughlyC．entirely D．ex
• 园艺师将一株野生的菊花，培育成具有多种颜色多个花朵的“塔菊”，采用的技术是[]A．种子繁殖B．扦插C．嫁接D．压条-八年级生物
• (2013·江西，24)What a terrible experience！________，you're safe now—that's the main thing.A．An
• (2013·湖北，29)Don't defend him any more.It's obvious that he________destroyed the fence of t
• ________ we looked at it, the better we liked the oil painting.A．AsB．WhileC．The momentD．The more-英语
• You must keep it _______ in mind that education is the first productivity. A．mildlyB．firmlyC．tightly
• Chemical pollution will bring about a threat to agriculture and food chain, andto human health.A．fre
• The little girl is walking along the beach, happy and joyful, ________ bending down to pick up a be
• 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