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教材问答丨教科版小学科学六下2.4《多种多样的动物》教材问题解答

  • 2026-04-02 20:39:11
教材问答丨教科版小学科学六下2.4《多种多样的动物》教材问题解答
教科版科学六下教材问答

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4.多种多样的动物

P29我们已经感受到了植物世界的丰富多彩。那么,动物世界又是怎样的呢?动物宝宝和它们的爸爸妈妈有什么相同和不同呢?

答:例如,

动物家庭

相同与不同

长颈鹿

相同之处:都有长长的脖子,头上都长有长有一对鹿角,身上的花纹呈龟裂状,蹄子都颈是分两瓣的,尾巴上都有一簇黑色的毛

不同之处:小长颈鹿身体毛色较淡,尾巴上的毛较短。

大象

相同之处:身体灰色,长长的鼻子,上面布满褶皱,两片大大的耳朵

不同之处:小象没有象牙,鼻子上的褶皱较少

相同之处:面部较长,耳朵直立,颈部有鬃毛,都有马蹄,尾生有长毛

不同之处:小马颈部鬃毛较短,颜色较淡,尾毛和腿部毛色也较淡

相同之处:耳朵短小、直立,眼睛很大,都有明显胡须

不同之处:毛色不同,猫妈妈为棕色带黑色斑点,小猫为灰色带黑色斑点

相同之处:头小而圆,耳短,毛色基部为豹黄色,身上有很多斑点和花纹不同之处:毛较软,斑纹较浅

P30描述狗妈妈和每只小狗的毛色与花纹有什么相同和不同。

答:右边这只小狗的毛色和狗妈妈一样,都是棕色,左边这只小狗的毛色和狗妈妈不一样,是白色:它们身上都是没有花纹的。

P30 哪只小狗遗传了狗妈妈的毛色?哪只小狗相对妈妈的毛色来说发生了变异?

答:右边这只小狗遗传了狗妈妈的毛色,左边这只小狗相对狗妈妈的毛色来说发生了变异。

P30推测狗爸爸的毛色可能是什么样的,说说你的理由。

答:狗爸爸的毛色可能是白色,因为都是棕色的狗是生不出白色的狗,而狗妈妈是棕色,那么左边小狗的毛色就是来源于狗爸爸,所以推测狗爸爸的毛色可能是白色。

P30仔细观察,我们还发现狗宝宝遗传了狗妈妈的哪些特征?哪些方面发生了变化?

答:狗宝宝遗传了狗妈妈的身体比例和耳朵形状,而尾巴和毛色都发生了改变。

P30小组交流其他动物的遗传和变异现象。

答:

动物

遗传和变异现象

袋鼠

遗传:袋鼠的眼睛、耳朵形状、身形甚至神态都非常像

变异:袋鼠的面部毛色发生变化,袋鼠妈妈的鼻子上方毛色是白色,而袋鼠宝宝的鼻子上方毛色是黄色

企鹅

遗传:企鹅的姿态、尖尖的嘴、体型都很相似

变异:毛色发生要化,亲代企鹅背部是黑色,颈部是黄色花纹,而后代企鹅背部是白色,颈部没有黄色花纹

遗传:狗的四肢,尾巴很相似。毛色遗传“妈妈”,耳朵遗传“爸爸”

变异:小狗毛色为黄色,相对于狗爸爸的毛色发生了变化。小狗耳朵耸拉下来,相对于狗妈妈耳朵的形状发生了变化

P31自然界有许许多多的动物,你能根据下表中给出的几类动物的分类标准,为各类动物添加新成员吗?

像麻雀那样,身体上长有羽毛的动物是鸟类

像兔子那样,直接生下小动物,并用乳汁喂养小动物的动哺乳动物物是哺乳动物

像鲤鱼那样,终生在水中生活,用鳃呼吸的动物是鱼类

像蚂蚁那样,身体分为头、胸、腹三部分,有三对足的动物是昆虫

答:鸟类:画眉、八哥、金刚鹦鹉、白鹭、苍鹭、林雕、游隼、麻雀、鸽子等。

哺乳动物:狗、狼、熊、老虎、狮子、豹等。鱼类:黄花鱼、草色、鲍鱼、鲸鱼、鲨鱼等。

昆虫:七星瓢虫、蜻蜓、蝴蝶等。

P31“龙生龙,凤生凤,老鼠生儿会打洞”“一母生九子,连母十个样”分别描述的是什么现象?

答:1.“龙生龙,凤生凤,老鼠生儿会打洞"描述的是动物的遗传现象,任何生物都能通过各种繁殖方式产生与自己相似的个体,保持世代间的连续,以绵延其种族。遗传是相对稳定的,生物不轻易改变

从亲代继承来的发育途径和方式。因此,亲代的外貌、行为、习性以及其他优良特征可以在子代重现。

2.“一母生九子,连母十个样”描述的是动物的变异现象,后代与亲代有一些不同之处。意为同一个母亲,生出的子代却并不相同,就连双胞胎也有不同的地子跟妈妈一样拥有短而扁的嘴,尖而长的翅膀,像剪刀一样的尾巴,背部、颈部及尾部,呈黑色,腹部呈白色。

小北极熊跟妈妈一样拥有雪白的毛,长而稠密,鼻子和爪子是黑色的,还有厚厚的脚掌。

(2)生理及行为特征遗传。

公鸡打鸣、母鸡下蛋;狡兔三窟;小猫捉老鼠;小狗汪汪叫等。

⒉.变异现象。

变异一般有两种形式。一种是遗传物质发生变化而引起的变异,称为可遗传变异;另一种是在不同环境条件下产生的变异,其遗传物质没有发生变化,称为不可遗传变异。

动物的遗传现象大多属于可遗传变异,如金鱼的各种形态,白狗与黑狗的后代出现斑点狗,斑点狗的后代中还有斑点狗出现。不可遗传变异如印度白孔雀(基因突变)、脱毛的公鸡(病理变化)等。

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  1. CONNECT:[ UseTime:0.000469s ] mysql:host=127.0.0.1;port=3306;dbname=c_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000863s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000349s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000294s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000520s ]
  6. SELECT * FROM `set` [ RunTime:0.000201s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000618s ]
  8. SELECT * FROM `article` WHERE `id` = 461750 LIMIT 1 [ RunTime:0.000586s ]
  9. UPDATE `article` SET `lasttime` = 1775645796 WHERE `id` = 461750 [ RunTime:0.008030s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000261s ]
  11. SELECT * FROM `article` WHERE `id` < 461750 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000467s ]
  12. SELECT * FROM `article` WHERE `id` > 461750 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000442s ]
  13. SELECT * FROM `article` WHERE `id` < 461750 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001365s ]
  14. SELECT * FROM `article` WHERE `id` < 461750 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000558s ]
  15. SELECT * FROM `article` WHERE `id` < 461750 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006778s ]
0.092945s