蜘蛛是怎么样结网的?
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">在蜘蛛的腹部,有三对突起,这<span style="color: black;">便是</span>结网用的“纺绩器”。它和<span style="color: black;">身体</span>的丝腺相通,丝腺中<span style="color: black;">能够</span>分泌出一种叫做纤维蛋白的黏液,当丝腺分泌黏液时,黏液遇到空气就会凝结成细丝,细丝的粗细<span style="color: black;">仅有</span>人头发丝的1/10。蜘蛛吐出的丝有杀菌<span style="color: black;">功效</span>,<span style="color: black;">因此</span>蜘蛛网在空气中<span style="color: black;">长时间</span>不会腐烂。蜘蛛<span style="color: black;">能够</span><span style="color: black;">按照</span><span style="color: black;">区别</span>的需要分泌出<span style="color: black;">区别</span>颜色、<span style="color: black;">区别</span>性质的细丝,<span style="color: black;">而后</span>再用这些丝结成<span style="color: black;">区别</span>形状的网。蜘蛛结网时,先喷出干丝拉出个框架,再拉出圆网的半径线,把一个圆分成若干等分,每两根相邻的半径线的夹角大致相等。拉完半径线以后,从中心向外盘旋,喷出丝来织成稀疏的螺旋形骨架,接着又从外圈<span style="color: black;">起始</span>,织成越来越密的圈,当达到中心位置时,空出<span style="color: black;">一起</span><span style="color: black;">地区</span>,这<span style="color: black;">便是</span>它的“中军帐”。经过艰苦的劳动,<span style="color: black;">最终</span>织出了<span style="color: black;">美丽</span>的蛛网。</p>
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<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">蜘蛛在网上走来走去,<span style="color: black;">为何</span>不会粘在网上呢?原来蜘蛛在网上行走时,它的脚上会分泌出一种<span style="color: black;">奥妙</span>的油质,<span style="color: black;">这般</span>,它走在网上就<span style="color: black;">能够</span>通行无阻、来去自由了。蜘蛛堪<span style="color: black;">叫作</span>自然界中的“纺织能手”,它们编织的网琳琅满目,有圆形的、有三角形的、有漏斗形的、有车轮形的,有的像盘子,有的像蚕茧,有的像蚊帐,还有的像雨伞。大<span style="color: black;">都数</span>蜘蛛天天织网,<span style="color: black;">况且</span>是在黎明前半小时编织好,从不耽误。</p>
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<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">跳蛛</p>
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<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">蜘蛛属于节肢动物中的蛛形类,种类<span style="color: black;">非常多</span>,全世界大<span style="color: black;">大概</span>35000种,它们中有的结网,有的不结网;<span style="color: black;">平常</span>的结网蜘蛛有圆蛛、球腹蛛、壁钱、络新妇等,不结网的蜘蛛有蝇虎、狼蛛、跳蛛、蟹蛛等。能结网的蜘蛛,头胸部和腹部都不分节,头胸部的前端有八个单眼,能感知光线的强弱;头胸部的腹面有六对分节的中趴肢,<span style="color: black;">第1</span>对叫做螯肢,尖端有毒腺孔,用来捕食或自卫;在腹部后端有三对突起,叫做纺绩器,蜘蛛用它来结成网。结网的蜘蛛用蜘蛛网<span style="color: black;">捕捉</span>小型昆虫,不结网的蜘蛛到处游走捕食。蜘蛛是对类有益的动物。</p>
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<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">三角蟹蛛</p>
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你的话语如春风拂面,温暖了我的心房,真的很感谢。 你的努力一定会被看见,相信自己,加油。
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