植物种子的传播方式ppt课件

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人教版(部编本)植物妈妈有办法第二课时课件PPT完美版

人教版(部编本)植物妈妈有办法第二课时课件PPT完美版
柳树在风中扭摆着腰肢,尽情地跳舞。
粗心的小朋友却得不到它。 大自然中的知识有太多太多,只有有心的孩子才能获得其中的知识,粗心的孩子只会白白错过。
她让豆荚晒在太阳底下。 孩子们就乘着风纷纷出发。
凤仙花的果实会弹裂,把种子.
朗读指导:这一整节以俏皮、喜悦的语气读,“啪”字要读得干脆响亮。
本句介绍植物旅行,为什么要提牛、马、鸟?
(难点) 这个疑问句不仅激发读者的兴趣,引起下文,而且照应了题目。
通过上节课的学习,我们了解了哪些植物种子的传播方式?
蒲公英
苍耳
豌豆
新知探究
指植物的种子。
从这句话中你知道 了什么?
孩子如果已经长大,就得告别妈妈,四海为家。
指成熟。
指种子在各个 地方生根发芽。
这句话采用拟人的修辞方法描写了自然 界中植物种子的生长规律。
柳树在风中扭摆着腰肢,尽情地跳舞。
一、用红线将搭配恰当的词连起来。
这里把蒲公英果实上的绒毛比作“降落伞”比喻形象,还运用了拟人的修辞,读起来亲切。
作者用拟人的手法生动形象地介绍了蒲公英、苍耳、豌豆传播种子的方法,让我们知道了要留心观察身边的大自然。
蒲公英妈妈准备了降落伞, 弹向四方,这是机械传播种子的又一例。 蒲公英妈妈为孩子准备了什么?用蓝线画出。
本句介绍植物旅行, 为什么要提牛、马、 鸟?
牛马有脚,鸟有翅膀,植物旅行又用什么办法?
这个疑问句不仅激发读者的兴趣,引起下文, 而且照应了题目。
蒲公英妈妈为孩子准备了什么?用 蓝线画出。这句话运用了哪种修辞? 有什么好处?
蒲公英妈妈准备了降落伞, 把它送给自己的娃娃。
这里把蒲公英果实上的绒毛比作“降落伞” 比喻形象,还运用了拟人的修辞,读起来 亲切。

种子的繁殖ppt课件

种子的繁殖ppt课件

04 种子繁殖的应用
农业种植
粮食作物
种子是农业种植的基础,通过播种种子,可以生产出大量的粮食 作物,满足人类的食物需求。
经济作物
除了粮食作物,种子还可以用于种植各种经济作物,如油料、棉花 、茶叶等,为人类提供各种经济价值。
蔬菜和水果
种子繁殖也是蔬菜和水果种植的重要方式之一,通过种子繁殖可以 快速获得大量幼苗,提高产量。
防虫防鼠
采取措施防止害虫和老 鼠侵害种子,如使用防
虫剂、捕鼠器等。
防晒防冻
避免阳光直射和过低的 温度对种子的影响,选 择阴凉、温度适宜的储
存地点。
定期通风
保持储存环境的空气流 通,防止种子缺氧窒息 ,定期翻动种子,使其
通风均匀。
06 种子的研究和发展种子的研究现状源自010203
种子生物学
研究种子的形成、发育、 成熟和萌发的生物学过程 ,以及种子中遗传物质和 营养成分的储存与传递。
在幼苗生长阶段,植物通过光合作用获取能量,并逐渐形成完整的根、茎、叶等器 官。
幼苗生长需要充足的阳光、水分和养分等环境条件,同时还需要适宜的温度和湿度 。
开花结果
开花结果是植物生殖生长的重要 阶段,是植物繁殖后代的关键环
节。
在开花结果阶段,植物通过开花 结实产生种子,完成繁殖过程。
开花结果需要适宜的光照、温度 和湿度等环境条件,同时还需要
种子生态学
研究种子与环境之间的关 系,包括种子的传播、萌 发和生长与环境因子的相 互作用。
种子生产技术
研究种子的繁殖技术,包 括种子繁殖、种子生产和 种子改良的方法和技术。
种子的未来发展
种子遗传改良
01
利用现代生物技术手段对种子进行遗传改良,提高种子的抗逆

种子的旅行--课件

种子的旅行--课件

生态环境的改变和影响
种子传播的轨迹及种子的存活对环境的改变具有显 著的影响。(来源:《生态学》)
森林的种子传播和维护
天然森林和林业造林的成功,很大程度上依赖于种 子数量和质量。(来源:《生态学》)
水域的生态平衡
水生植物的种子传播对水域的生态平衡有很大贡献。 (来源:《植物学》)
种子传播的意义和 动物传播
人工传播
光合作用
利用风力将种子传播,例如枫树的种子。
利用河流或潮汐等水力将种子传播。
利用动物的行动和消化系统等将种子传播,例如鸟 类和哺乳动物。
人类通过种植和人工销售等手段传播,如农业和花 卉市场。
植物通过自身光合作用将种子传播。
种子的旅行轨迹
1
植物种子的旅行
种子通过风力或者动物帮助传播移动到其他地方(来源:《种子的旅行和传播研 究》)。在新的环境下,种子会吸水膨胀、发芽生长。
保护和利用种子,研究其萌 发和成长,探究种子的神奇 之旅。
参考文献
1. 《种子学》 2. 《植物学》 3. 《生态学》 4. 《种子的旅行和传播研究》
根的生长与分叉
根向下生长,并不断吸 收养分和水分,有些根 会分叉。(来源:《生 态学》)
叶片的生长与光合 作用
光合作用是植物制造能 量所必须的过程,植物 通过绿色的叶子来吸收 光线进行光合作用,并 生长出新的叶子。
其他因素影响成长
植物的成长还受到水分、 营养和生物环境等诸多 因素的影响。
种子传播的意义
3 种子的主要作用
承载基因并传递给下一代,传播和繁殖。(来源:《植物学》)
种子传播的重要性
保留多样性
不同传播方式导致的种子分布使得 生物多样性得以保留。(来源: 《生态学》)

教科版科学四年级下册 1.7《种子的传播》课件(32张PPT)

教科版科学四年级下册 1.7《种子的传播》课件(32张PPT)
2.下列植物中,( B )不是靠动物传播种子的。 A.苍耳 B.椰树 C.野葡萄
3.句“杨花榆英无オ思,惟解漫天作雪飞。”从文学的角度 写出了杨树和榆树的种子的传播方式是(A )
A.风力传播 B.水力传播 C.动物传播生长在海边有利于种子的传播。( √ ) 2.种子和果实的外部形态、结构与种子的传播方式之间是有 联系的。( √ ) 3.蒲公英种子上有毛,容易随风飘移传播种子。( √ ) 4.鸟能传播一些植物的种子。( √ ) 5.通过动物传播的植物种子一定是动物爱吃的。(✘ ) 6.油菜花的种子又小又轻,依靠风力传播。( ✘)
(三)蒲公英种子的传播
活动任务
①观察蒲公英的果实 ②描述蒲公英果实的外部特征 ③推测蒲公英是怎样传播种子的
科学 新知讲解
我的发现
蒲公英果实很小、并且有冠毛,风一吹就 能飘到空中,因此它们借助风力进行传播
科学 新知讲解
槭树的果具双翅,像长了翅膀的鸟, 借助风力将其中的种子带向远方。
蓟的果实像蒲公英的种子, 也是靠风力传播。
科学
种子的传播
科学教科版 四年级下
科学 新知导入
果实里面有种子。果实成熟后,就要把种子传播 出去。在适宜的环境下,种子萌发长出新的植物
你知道吗
种子为什么要向远处传播?
科学 新知导入
资料卡片
如果植物的种子都掉落在植物近旁 ,种子的成活机会会变小,或种子 成活的数量会很少。因为在这种情 况下,种子在发芽成长时会导致大 量同种植物挤在一起,进而导致植 物养分、阳光等生长要素的不足, 影响植物生长,最终的结果就是这 一家子都死光。所以植物都尽量把 种子远远地传播出去。
科学 新知讲解
莲蓬、椰子的种子在水中不会腐烂吗?
莲蓬、椰子等通过水力传播的植物 的果实在水中不会腐烂下沉。因为 它们的果实果皮厚实,里面含有丰 厚的、很轻的纤维质,可以让果实 漂浮在水面,还可防止种子因浸泡 ,吸水而腐烂或下沉。

《植物妈妈有办法》ppt课件

《植物妈妈有办法》ppt课件

阅读第2~5小节,思考:
这篇课文写了哪几种植物妈妈传播种子的
好方法?她们是用什么办法让孩子离开的?
蒲公英
苍耳
石榴
豌豆
bèi
蒲公英妈妈准备了降落伞,
准备
备好
把它送给自己的娃娃。
只要有风轻轻吹过,
fēn
纷纷
孩子们就乘着风纷纷出发。 纷飞
蒲公英

降落伞
蒲公英的种子
怎样理解这节诗? 运用了比喻的手法。把蒲公英的种子
植物传播种子的方法
品读课文
自由朗读第1小节。

假如 孩子如果已经长大, 就得告别妈妈,四海为家。
牛马有脚,鸟有翅膀,
zhí lǚ
旅游
种植 植物旅行又用什么办法?
孩子如果已经长大, 植物种子已经成熟 就得告别妈妈,四海为家。 植物种子到 牛马有脚,鸟有翅膀, 处生根发芽 植物旅行又用什么办法? 植物传播种子
苍耳果实的外皮长 满刺,对苍耳种子起保 护作用,所以说“带刺 的铠甲”,这样写更加 生动、形象。
铠甲
苍耳
苍耳妈妈为孩子准备了带刺的( 铠甲), 孩子可以(挂住动物的皮毛)离开妈妈。
苍耳妈妈有个好办法, 她给孩子穿上带刺的铠甲。 只要挂住动物的皮毛, 孩子们就能去田野、山洼。
石榴妈妈的胆子挺大, 她不怕小鸟吃掉娃娃。 孩子们在鸟肚子里睡上一觉, 就会钻出来落地安家。
例 我们应该为(wèi)中华民族的伟大复兴而有 句 所作为(wéi)。
(de)跑得快 得
(dé)为什么 为了
辨 作助词时,读de,表示“得到”“得意”“适 析 合”时,读dé。
例 他跑得(de)很快,得(dé)到了第一名的好
句 成绩。

幼儿种子的传播ppt课件

幼儿种子的传播ppt课件

03
种子传播的机制
传播的物理机制
风力传播
种子借助风力进行传播, 如蒲公英种子。
水利传播
种子借助水流进行传播, 如椰子。
动物传播
种子通过动物活动进行传 播,如鸟类摄取种子并排 泄到其他地方。
传播的生物机制
自然选择
种子在自然选择过程中,适应环境变化的个体更 容易生存下来并繁殖后代。
基因变异
种子在繁殖过程中会发生基因变异,产生新的性 状和特征。
• 幼儿种子传播的特殊性:与成年植物相比,幼儿种子的传播过程更加复杂和独 特。幼儿种子需要经过一段时间的休眠期,在适宜的环境下才能萌发生长。
• 种子传播的策略:为了提高传播效率和适应不同的环境条件,植物采取了多种 种子传播策略,如风力传播、动物传播等。这些策略能够将种子散布到更广泛 的地域,增加种群的生存空间。
城市绿化
城市绿化建设
种子传播在城市绿化中发挥了重要作用,可以迅速增加城市中的植被覆盖率, 改善城市环境。
降低城市热岛效应
植被可以降低城市的气温,减少城市热岛效应,改善城市居民的生活质量。
06
结语
结语
• 种子传播的意义:种子传播是植物繁衍生息的重要环节,通过传播,新的植物 能够拓展生存空间,增加种群数量,适应不同的环境条件。
比较远的地方。
水力传播
01 02
水流传播
借助水流传播的种子通常具有硬壳,可以防止在水中被冲走或被水溶解 。这些种子通常会随着河流、湖泊等水流而流动,从而扩大了种子的分 布范围。
水流速度与距离
水流传播的速度和距离取决于水流的速度和地形条件。水流速度越快, 传播的距离就越远。
03
沉积与发芽
当水流中的种子沉积在适合的地方时,它们就有可能发芽并生长成新的

种子的传播方式

种子的传播方式

莲蓬
靠自身的力量来传播
• 我们常见的豆荚,当它成熟后,干燥而坚 硬的果皮在似火骄阳的烘烤下,常常“啪” 的一声爆裂,种子就会像飞出枪膛的子弹, 被弹射到远处,所以大豆、油菜、芝麻等 经济作物,成熟后一定要及时收获,不然, 种子就会散布田间,使人们遭受损失。凤 仙花妈妈的办法跟豌豆妈妈的办法差不多, 凤仙花果实成熟后炸裂,凤仙花妈妈用这 种办法把种子送到四面八方。
白花鬼针草
苍耳
狗尾巴草
3、靠水传播
• 水中和沼泽地生长的植物,它们的种子往往借水 力传送,如我们常见的莲的果实,也就是莲蓬, 其形状呈倒圆锥形,且质轻,可以像一叶小舟飘 浮于水面,随着水流漂到各处,同时也把种子远 布各地; • 还有陆生植物中的椰子,它的果实更是有多重 的功能,椰果的中果皮十分疏松,富含纤维,能 适应在水中飘浮,内果皮又极坚厚,可以保护种 子免受海水的侵蚀,果实里还含有大量的椰汁, 足以供给种子萌发时所需的营养和水分,这就使 椰果能在咸水的环境条件下萌发。热带海岸有许 多椰林分布,与椰果的这一本领是密不可分的。
豌豆
• 一些植物还具备自动播种的特殊装置,有 一种名为“喷瓜”的植物,它会结出带有 毛刺的其貌不扬的小瓜,你可知道它的奥 秘?当瓜成熟时,只要稍有触动,它便会 脱落,并在瞬间从顶端将瓜内的种子喷射 出去,射程可达6米,“喷瓜”也因此得名。
• 最有趣的是麦田里生长的野燕麦的种子, 它能够自己“爬”进土中。野燕麦种子的 外壳上长有一根长芒,会随着空气湿度的 变化而发生旋转或伸直,种子就在长芒的 不断伸曲中,一点一点地向前挪动,一旦 碰到缝隙就会钻进去,第二年便会生根发 芽。当然,野燕麦种子“爬行”的速度相 当缓慢,一昼夜只能前进1厘米,然而这种 传播种子的本领已经达到了登峰造极的地 步。

植物种子传播的方式(Thewayplantspropagateseeds)

植物种子传播的方式(Thewayplantspropagateseeds)

植物种子传播的方式(The way plants propagate seeds)The way plants propagate seedsAnemophily (Pu Gongying) 3 (pollen) water (Jin Yuzao). There is also an explosion of its own (beans). Human propagation, animal carrying (Cang Er),Do you know the secret of spring: flying catkins flying? Catch a catkins look carefully, will find some small particles, it is the seeds of willow, willow catkins flying is to rely on the seeds spread far away home. There are also seeds of poplars and dandelions.Take a look at this plant belonging to the gourd family and have a small melon with a burr". When the melon is ripe, slightly touched the melon will fall, and the guane seeds together with mucous ejected from the top, a range of up to five meters away, how magical it ecballium was named.You may have seen the Xanthium sibiricum, and every autumn, when its fruit is ripe, you will find the opportunity to hook it up on the person or animal that touches it and take the opportunity to travel. Oexamine will find its bristle tipped with barbs, imperceptibly you have seed spread its obligations.Throw some plants by mechanical means of seed spread out, Oxalis is one example. It is a very common wild weeds, small yellow flowers or small flowers, flowers after the knot with five edges of the capsule, when ripe fruit along loculicidal, shell curled,seed will pop up.Bomb Impatiens can also play the fruit cracking than Shamrock throw too strong, the bullet to the Quartet, tooAnother example of mechanical dispersal of seeds.How do plants propagate seeds?When fruits and seeds are mature, plants generally rely on wind, water, and animals.Seeds or fruits that are carried by the wind are very light in structure. For example, rounded wings and maple elm around the fruit wings of the wings, to adapt to the spread of wind. Dandelion achenes very small, long crested top, like a parachute, when mature, as long as the wind will fly far away, "settle down".Certain activities of human beings and animals often help plants to spread seeds intentionally or unintentionally. For example: Bidens pilosa, Xanthium sibiricum and other plant seeds on a hook or thorn, can hook in animal fur and people's clothes, was taken away. Some birds often eat some fruit plants, these plants the seed coat is hard, not easy to be digested, so when the bird defecation will, with seed, germinate and grow up in a new place.Water flow is also a way of transmitting seeds and fruits. After heavy rains, many fruits and seeds are often washed elsewhere. Not afraid of coconut water immersion, and floating, it canacross the sea, so the growth of coconut in the tropical islands and coasts.Other plants spread seeds by their own special functions, such as pods that crack themselves when they mature and shoot seeds out. Such a way is known as auto propagation.Most of the seed plants are relying on seed breeding. The way seeds are transmitted, according to the literature, has many different classifications, and can be broadly divided into the following four ways: Animal transmission, wind propagation, water transmission, and self propagation!Here are some examples:1 animal transmission(1) birds propagate seeds that are transmitted by birds, mostly fleshy fruits, such as berries, drupes, and flowers. Lauraceae and Ficus species of birds favorite foods, birds of Lauraceae seed after seed spit. According to the results of this study, scholars speculate that the seeds of birds through the seeds of the plant is a relatively advanced group, because the birds spread the distance of the seeds is the farthest in all ways.(2) ants, which spread ants on seed dispersal, usually act as the two propagator. Some birds feeding seeds, but not all consume all the nutrients, the seeds that fall on the ground on the surface there are some remnants of nutrient for ants feeding on a second-hand spread this time are ants.(3) mammalian transmission of mammals, most of which belong to some medium, large fleshy fruits or nuts. Generally speaking, mammals are large in size and require large amounts of food, so they choose large fruits. For example: Fagaceae seeds mainly rely on rodent animal to spread; Taiwan and Taiwan enjoy feeding monkeys hair persimmon banana fruit, also help these plants spread(4) certain activities of human beings and animals often help plants to spread seeds intentionally or unintentionally. For example: Bidens pilosa, Xanthium sibiricum and other plant seeds on a hook or thorn, can hook in animal fur and people's clothes, was taken away. Salicaceae in poplar by Yang Xu spread the seeds of poplar infructescence will be ripe, fruit cracking Yang Xu flies away on the street, Yang Xu spread can cause environmental pollution, therefore, should be a male poplar trees, not a female poplar.2 winds propagationSome seeds will grow wings or shapes such as feathery appendages, fly with the wind. In Taipei botanical garden winged seeds contain Qingfeng, India rosewood and many gymnosperms; having feathery appendages are mostly herbaceous plant seeds. In addition, some small seeds, which have a relatively large proportion of surface area to weight, can therefore be seeded with the wind.Compositae achenes mature dandelion, pappus, like a parachute, flapping in the wind, the seeds spread far away.3 water transmissionWater flow is also a way of transmitting seeds and fruits. After heavy rains, many fruits and seeds are often washed elsewhere. Not afraid of coconut water immersion, and floating, it can across the sea, so the growth of coconut in the tropical islands and coasts.4 autologous transmissionSome plants rely on mechanical seed spread out, Oxalis is one example, it is a very common wild weeds, small yellow flowers, flowers after the knot with five edges of the capsule, when ripe fruit along loculicidal, seed shell curling pop, projectile to the distant. The fruit of the Impatiens flower can crack and stretch the seeds to the four directions. This is another example of mechanical dispersal of seeds.How do plants propagate seeds?Plant pollination is divided into two kinds, with pollination and cross pollination; which is mainly by cross pollination insects carry pollen, called anthophilous pollen; depend on wind power transmission, anemophilous flower.Common methods of plant dispersal:Salix rootDo you know the secret of the spring catkins flying? Catch a catkin, careful observation will find some small particles, itis the seeds of willow, willow catkins flying by the seeds spread far away.PoplarSalicaceae in poplar by Yang Xu seed dispersal, see the infructescence image of poplar to mature fruit cracking Yang Xu is flying around the street, Yang Xu spread can cause environmental pollution, therefore, should be a male poplar trees, not a female poplar.DandelionCompositae achenes mature dandelion, pappus, like a parachute, flapping in the wind, the seeds spread far away.Creeping oxalisSome plants rely on mechanical seed spread out, Oxalis is one example, it is a very common wild weeds, small yellow flowers, flowers after the knot with five edges of the capsule, when ripe fruit along loculicidal, seed shell curling pop, projectile to the distant.ImpatiensThe fruit of the Impatiens flower can crack and stretch the seeds to the four directions. This is another example of mechanical dispersal of seeds.Siberian CockleburYou may have seen this plant Xanthium, when autumn field trip back, its fruit will be hanging on your clothes, look carefully at its top with barbed bristles, can be hooked, not easy to fall off, imperceptibly you have seed spread its obligations. There are still many similar such cocklebur seed dispersal plant in pastoral areas, this plant of wool textile industry is a major pest in this plant, wool with bristles will greatly reduce the quality of the finished products, and textile industry can check burr process.Acer sinenseMaple fruit with wings like the wings of birds, the seeds far away.EcballiumThis is a plant belonging to the gourd family. It has a small melon with a burr. Do you know the secret of this melon? When the melon mature, slightly touched, this "melon" will fall off, and from the top of the "melon" in the seeds together with mucus sprayed out, the range of up to 5 meters away, spray melon is also named. Spread the seeds ecballium in nature has reached the level of the ability to reach the peak of perfection.Method for propagating seeds by plantsIn fact, all kinds of methods of propagation can spread seeds for plants. Plants sometimes use a single method, but sometimes they plant them in a compound way.I. autologous transmissionSelf propagation is dependent on the plant itself and does not depend on other media. The fruit or seed itself has weight, mature fruits or seeds will fall to the ground by gravity directly, such as hair and large persimmon planchonella; and capsule and pod in mature fruit cracking occasion will produce ejection forces will eject the seeds, such as michelia. Dispersal of seeds by itself is limited by dispersal, but some self propagating seeds occur two times after falling off the ground. Birds, ants, and mammals are two possible propagators.Two. Wind propagationSome seeds will grow wings or shapes such as feathery appendages, fly with the wind. With feathery appendages the seeds of mostly herbaceous plants, such as Compositae youngia, woody plants are willow and kapok etc.. In addition, some small seeds, which have a relatively large proportion of surface area to weight, can therefore be seeded with the wind, such as the seeds of orchidaceae. Compositae achenes mature dandelion, pappus, like a parachute flapping in the wind, the seeds spread far away.Three. Water transmissionThe spread of the water on the seed surface wax is water (such as lotus), the skin contains a gas chamber, the proportion of water is low, can float in the water, through the stream or current transmission. The seed coat is fiber rich, can prevent the seed by soaking, water absorption and decay or sink, coastalplants, such as lotus leaf board feet, Tong and Terminalia has typical seed by water transfer.Four, birds spreadSeed borne by birds, mostly fleshy fruits such as berries, drupes, and flowers. Birds of Lauraceae seed after seed spit. After the fruit has been eaten, the seeds can be excreted at random. Plants that spread seeds by birds are more advanced, and the distances that are transmitted by birds are the farthest in all ways.Five, ants spreadAnts usually play the role of the two propagator in seed dispersal. Some birds feeding, seed dispersal, but not all consumed all the nutrients, the seeds that fall on the ground on the surface there are some remnants of nutrient for ants feeding on a second-hand spread this time are ants. These phenomena also occur in the seeds of self transmission or mammalian transmission.Six mammalian transmissionThe propagation of mammals, mostly of medium, large fleshy fruits or nuts. Generally speaking, mammals are large in size and require large amounts of food, so they choose large fruits. Rhesus monkeys, for example, enjoy feeding on the fruits of Diospyros kaki and Musa and also help spread these plants.The world is rich and colorful life, every life in his own wayto reproduce, "children grow up, have to say goodbye to my mother at home". Horses have feet, birds have wings, and all over the world to plant the seeds of life spread to every corner of the earth, what to rely on? As everyone knows, the seed is an important role of the plant family, but also by its amazing ability to travel around, the plant will be settled everywhere.There are two ways in which plant seeds are transmitted: one is by means of external forces, such as wind, hydraulic power, animals and human beings; and the other is by the power of their own two. In order to plant offspring of their own, can be said to be "The Eight Immortals Crossing the Sea Gexianshentong".The wind is everywhere, and the wind on the earth becomes a free vehicle for seed travel". The seeds dispersed by wind are generally small and light, suspended in the air and blown to distant places by the wind; some of the seed surfaces often produce flocculent hairs, fruit wings, etc. these special structures are suitable for flying with the help of wind force. For example, the most common our southern herb, a small umbrella, its seeds on the wind blows, the small umbrella with seed float float, float to distant place; and as the poplar and willow seeds, long, soft hairs, a spring in May to fly, fly to a distant place; and pine, maple, elm seeds covered with tiny wings, with the wind, you can easily fly from all sides, with the expansion of the site.Humans and animals also help plants spread seeds. Some students are outside the seed spines and barb or secrete mucus, one touch, it will immediately adhere to the people's clothes or animal hair, feather, you see, to put it off, tossed to the ground,then it spread wish come true, such as cocklebur and steal clothes, etc. some fruit plant bidens; bright color, sweet and juicy, can attract the animal to feeding, to spread the seeds, such as birds or other animal feed discarded cherry cherry seeds, seed dispersal work as it inadvertently, if even the skin to swallow hard tape, cherry stone can also resist the acid in the digestive tract, protect the seed retreats, and humans in feeding these delicious fruits, often the stones handily abandon, unwittingly became the seed dispersal of "angels"; there are some Kennedy Fruit seeds, such as chestnuts and pine nuts, are the squirrel's favorite food. They are carried home by squirrels and stored. Some are eaten, and the rest of them are taken root in the coming year.The water and marsh plants, their seeds often by hydraulic transmission, such as our common lotus fruit, is the lotus, the shape of an inverted cone, and the light, like a boat floating on the water, with water drift everywhere, but also put the seeds spread far and terrestrial plants; the coconut, its fruit is of multiple functions, coconut mesocarp is very loose, rich in fiber, can adapt to float on the water, and very thick endocarp, can protect seeds from seawater, fruit also contains a lot of Coconut Juice, to provide the required nutrients and moisture during seed germination this makes, coconut can germinate in brackish water conditions. The tropical coast there are many coconut and coconut distribution, this ability is inseparable.Another form of seed propagation is through its own power. Our common pods, when it is ripe, dry and hard skin with sun baking, often "bang" burst, like seeds will fly out of the barrel ofa bullet, was catapulted into the distance, so soybean, rapeseed, sesame and other economic crops, mature after harvest must be timely, otherwise. The seeds will spread the field, make people suffer losses.Some plants have special automatic seeding device, there is a called "ecballium" plants, it will bear the little ugly in appearance with burr melon, you know the secret? When the fruit is mature, as long as slightly touched, it will fall, and in an instant from the top of the seed will guane ejected, range of up to 6 meters, hence the name "ecballium".The most interesting is the seed of wild oats grown in the wheat field, which can climb itself into the soil. Wild oat seed shell length has a long awn, along with the change of air humidity and rotate or straight, seeds in the continuous stretching long awn, a move forward, once encountered cracks will drill in second years, will take root. Of course, the Wild Oat Seed "crawling" speed is quite slow, one day can only move 1 cm, but the seed dispersal ability has reached the point of reach the peak of perfection.In nature, plants to survive and develop, will try to offspring of their own, so in the process of evolution of millions of years, each plant has let his seed "travel" special skills, the seeds can be widely spread, the phenomenon of life and growth in nature, magic, causing humans to marvel.。

小学科学教科版四年级下册高效课堂资料《把种子散播到远处》探究课件1

小学科学教科版四年级下册高效课堂资料《把种子散播到远处》探究课件1
精品课件
小学科学教科版版四年级下册 高效课堂后,它们是怎样传播出去的? 为什么要有这么多的传播方式呢?
科学探究:油菜传播种子的方式 油菜果荚
科学问题
油菜种子的哪些特点适合于这样的传播方式?
种子成熟后,如果都掉落在植物的近旁,会 产生怎样的情况呢?
翠菊
散播方式
植物名称
5/5/2019
萝摩
白蜡树 泡桐
5/5/2019
梧桐 月季
狗尾草 鸡冠花
观察:各种植物种子的传播
苍 耳 种 子 的 传 播
各种植物种子的传播
葡 萄 种 子 的 传 播
各种植物种子的传播
松 树 种 子 的 传 播
各种植物种子的传播
蒲 公 英 种 子 的 传 播
各种植物种子的传播
植物散播种子的方式

植物种子的各种传播方式

植物种子的各种传播方式

植物种子的各种传播方式
人工播种:大多数靠人工播种。

水力传播
如海南岛的椰树林长在江河边,椰子成熟了,有的落在江河里,随着水流漂向河边的淤(yū)泥,种子沉淀在淤泥里,来年就长出小椰树苗。

还如莲子。

风力传播
柳树就是靠柳絮的飞扬把种子传播到远处去安家的。

还有同杨树、槭树、木棉和蒲公英等的种子。

动物传播
如松鼠爱吃松子,未吃掉的松子掉入石缝碎石间。

第二年,松子萌发新芽,长出小松苗来。

白头翁、黄莺等吃了野葡萄后,种子没有消化便排泄出来,遗落在土里,来年便长出新苗来。

弹射传播
例如:香叶草、油菜、大豆、凤仙花等,它们是靠弹射方式传播的。

还有喷瓜,在瓜成熟时,会将瓜内的种子喷射出去,距离可达五米之远。

喷瓜也因此而得名。

《植物的种子》植物的生长PPT课件-完美版

《植物的种子》植物的生长PPT课件-完美版

师:含义 深刻的 句子表 面是一 层意思 ,却暗 含着更 深的意 义。那 么本组 课文中 有哪些 类似的 句子, 我们都 是用什 么方法 去理解 这些句 子的?
(2)学生 找句子 ,交流 体会方 法。
(3)教师 归纳总 结体会 含义深 刻的句 子方法 :
联系上下 文;联 系生活 实际; 结合时 代背景 ;展开 丰富联 想。… …
《植物的种子》植物的生长PPT课件- 完美版 《植物的种子》植物的生长PPT课件- 完美版
《植物的种子》植物的生长PPT课件- 完美版
仔细观察这些植物的种子,它们有哪些不同?
大豆
花生米
稻谷
小麦
玉米
蚕豆
棉籽
向日葵籽
菜豆
《植物的种子》植物的生长PPT课件- 完美版
红豆
南瓜籽
蓖麻籽
《植物的种子》植物的生长PPT课件- 完美版
《植物的种子》植物的生长PPT课件- 完美版
每种植物的果实都有它传播种子的方式,以使种子
获得更大的生存机会。你知道种子是怎样“旅行”的吗?
浆 果(女贞树)
动物运送
《植物的种子》植物的生长PPT课件- 完美版
坚果(松果)
动物传播
刺 果(鬼针草) 刺 果(苍耳子)
《植物的种子》植物的生长PPT课件- 完美版
《植物的种子》植物的生长PPT课件- 完美版
1、谈谈心 目中的 鲁迅
(1)学了 本单元 的课文 ,我们 被鲁迅 先生的 才学和 人格魅 力所折 服,这 节课我 们就来 谈谈自 己心目 中的鲁 迅。
(2)提出 要求: 可以就 课文来 谈,可 以结合 课外学 习的收 获来谈 ;可以 讲同鲁 迅有关 的人和 事,也 可以说 说读鲁 迅作品 的体会 。

植物的种子传播和繁殖方式

植物的种子传播和繁殖方式

动物传播
鸟类:鸟类食用果 实后,种子随粪便 排出,传播到其他 地方
哺乳动物:哺乳动 物食用果实后,种 子随粪便排出,传 播到其他地方
昆虫:昆虫食用果 实后,种子随粪便 排出,传播到其他 地方
其他动物:如蝙蝠 、猴子等,也会传 播种子
水流传播
概念:种子通过水流进行传播
特点:速度快,距离远,但方 向不确定
过程:包括取材、消毒、培养、移 栽等步骤,需要严格的无菌操作和 技术支持
孢子繁殖
定义:孢子繁殖是一种无性繁殖方式,通过产生孢子来繁殖后代。 过程:孢子繁殖通常包括两个阶段,即孢子形成和孢子萌发。 特点:孢子繁殖速度快,可以大量产生后代,但遗传多样性较低。 应用:孢子繁殖在植物育种、生物制药等领域具有广泛应用。
植物的种子传播和 繁殖方式
XX,a click to unlimited possibilities
汇报人:XX
目录
CONTENTS
01
植物种子的传播方式
02
植物种子的繁殖方式
植物种子的传播方式
第一章
风力传播
特点:借助风力将种子传播到远处
种子形态:通常具有轻巧、细小、带毛或翅等特征,易于被风吹起 传播过程:种子成熟后,借助风力脱离母体,随风飘荡,最终在适宜的 环境中落地生根 例子:蒲公英、柳树、杨树等植物的种子都是通过风力传播的。
植物种子的繁殖方式
第二章
有性繁殖
概念:通过两 性生殖细胞结 合,形成新的
个体
过程:开花、 传粉、受精、
结果
优点:增加物 种多样性,提
高适应性
例子:大多数 植物通过有性 繁殖进行繁殖, 如苹果、梨、
桃等。
无性繁殖
扦插:将枝条或叶片插入土壤中,使其生根发芽
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二、动物传播
2、樱桃、野葡萄、野山参等肉果类植物,靠小鸟 或其他动物把种子吃进肚子,由于消化不掉,便 随粪便排出来传播到四面八方。而人类在取食这 些美味水果时,往往会把果核随手抛弃,无意之 中也就成了种子传播的“使者”。
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樱桃
野葡萄
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二、动物传播
3、还有一些坚果类的种子,如板栗、松子等是松
植物种子的传播方式
1
传播方式
植物名称
弹 射 传 播 豌豆、喷瓜、凤仙花等
动物传播
苍耳、狼尾巴草、鬼针草、樱桃、 野葡萄、松果、板栗等
风 力 传 播 柳树、蒲公英、野茼蒿等
水 流 传 播 莲蓬、椰子等
2
一、弹射传播
我们常见的豆荚类、喷瓜、凤仙花, 当它成熟后,干燥而坚硬的果皮在似火骄 阳的烘烤下,常常“啪”的一声爆裂,种 子就会像飞出枪膛的子弹,被弹射到远处。
3
豌 豆
4
喷 瓜
5
凤 仙 花
6
二、动物传播
1、有些种子的外面生有刺毛、倒钩或能分泌粘液, 只要轻轻一碰,就会立即粘附到人的衣服或动物 的毛、羽上,等你发现了,把它摘下来,随手抛 到地上,这时候,它的传播心愿就实现了,如苍 耳、狼尾巴草、鬼针草等。
7
苍 耳
8
狼 尾 巴 草
9
白 花 鬼 针 草
16
柳 树
17
野 茼 蒿
18
蒲公英 19
槭树
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四、水流传播
水中和沼泽地生长的植物,它们的种子往往借水 力传播,如我们常见的莲的果实,也就是莲蓬,它可 以飘浮于水面,随着水流把种子远布各地。
陆生的椰子,它的果实中果皮十分疏松,富含纤 维,能适应在水中飘浮,内果皮又极坚厚,可以保护 种子免受海水的侵蚀,果实里还含有大量的椰汁,足 以供给种子萌发时所需的营养和水分,这就使椰果能 在咸水的环境条件下萌发。
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莲蓬
22
椰子
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思考: 为什么种子有这么多种传播方式呢?
种子和果实的传播必须适应自身的特点,种子和果实的特 点也多种多样。
因此,植物传播种子的方式是多种多样的,都是 为了把种子传播得更广,有利于繁殖后代。
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问题: 请正确连接下面植物种子的传播方式
弹射传播
动物传播
风力传播 水流传播
25
谢谢大家!
26
鼠最喜爱的食物,它们被松鼠搬回家储存起来, 一部分会被吃掉,剩下的,来年就生根发芽了。
13
松 子
14
板 栗
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三、风力传播
借助风力来传播的种子,通常质量较轻能悬浮在 空气中,并随风运动到各处。
有些植物的种子还长出一些适合于借助风力飞翔 的特殊构造。如柳树、野茼蒿种子上的细绒毛;蒲公 英果实上的伞状冠毛;槭树等种子的一部分果皮和种 皮展成翅状等等。
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