گیاه شناسی
شنبه 21 دی 1387

جلبک

شنبه 21 دی 1387

نوع مطلب :
نویسنده :ش ش

هر جا که اندکی خیس و یا مرطوب باشد گیاهان بدون گل یافت می‌‌شوند. ساده‌ترین آنها، جُلبَک ها، خزه ها، هپاتیکها و سرخسها هستند. اکثر آنها نزدیک و یا داخل آب زندگی می‌کنند و ریشه حقیقی ندارند بازدانگان، پیشرفته‌ترین گیاهان بدون گل محسوب می‌‌شوند. آنها دارای ریشه‌های عمیق و برگهای ضد آب هستند و می‌‌توانند در مکانهای خشک زندگی کنند.

جلبک ها معمولاً در حاشیه ها می رویند

اشنه دریایی غول پیکر، طویل‌ترین و زودرشدترین علف دریایی است. این گیاه که در سواحل کالیفرنیا یافت می‌شود در یک فصل می‌‌تواندبه طول 91 متر (300 پا) رشد کند. درخت سرخس که در نواحی مداری یافت می‌شود ،می‌تواند به ارتفاع بیش از 23 متر(75 پا) برسد و برگ ساقهایش نیز به طول 5 متر (16 پا) برسند. زمانی گیاهان ماقبل تاریخ از خانواده پنجه‌گرگیان جنگلهای عظیمی را شکل داده بودند آنها سنگواره شدند تا رگه‌های زغال سنگ امروزی را تشکیل دهند.

از دیگز نمونه‌های جلبک می‌‌توان به علف دریایی قرمز و علف صخره و کاهوی دیایی اشاره کرد.

پیشرفته ترین نوع جلبك chara نام دارد كه شبیه گیاهان است و حد واسط بین گیاهان و جلبك هاست.این جلبك ها بر خلاف سایر جلبك ها مایكروسكوپی هستند.و در wet land یافت می شوند.

و یك سری مراحل جنینی كه خاص گیاهان است و در سایر جلبكها دیده نمیشود در chara وجود دارد.

و چون chara فاقد بافت است جز گیاهان محسوب نمی شود.




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دوشنبه 18 شهریور 1398 04:29 ب.ظ
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یکشنبه 20 مرداد 1398 04:58 ب.ظ
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"And we all are going to have an ending which will be as none before."

His smile was decadent, his eyes were full of lust, plus the soft skin of
his hard cock against my sex was having its intended effect.
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سه شنبه 11 تیر 1398 12:03 ب.ظ
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He or she is handsome. Brown hair slicked back, glasses that suit his
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arms as well as a chest that is unique on this sweater.
We're standing right in front of one another discussing us, what
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He starts saying that he's got been rejected many times.


‘Why Andrew? You're so handsome. I'd never reject you ', I only say He smiles
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‘Oh, I wouldn't know. Everything happens for a reason right.
But let me know, you would not reject me, would you Ana?' He said.



‘No, how could I?' , I replied

"So, make use of mind if I kissed you currently?' he was quoted saying as I get far better him and kiss him.

‘Next time don't ask, just do it.' I reply.

‘I love how you think.' , he said.

For now, I start scrubbing my rearfoot within his leg, massaging it slowly. ‘What exactly do you prefer in women? And, Andrew, don't spare me the details.' I ask.

‘I love determined women. Someone that knows what they want. Someone that won't say yes although I said yes. Someone who's unafraid of attempting something mroe challenging,' he says. ‘I'm never afraid when you attempt interesting things, especially on the subject of making a new challenge in the bedroom ', I intimate ‘And I enjoy girls who are direct, who cut over the chase, like you may did. Being
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شنبه 8 تیر 1398 06:35 ب.ظ
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‘Why Andrew? You're so handsome. I'd never reject you
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"So, you would not mind if I kissed you right now?' he stated as I recieve more detailed him and kiss him.

‘The very next time don't ask, function it.' I reply.

‘I'm keen on how you will think.' , he said.

For the time being, I start scrubbing my high heel in the leg, massaging it slowly. ‘What can you prefer ladies? And, Andrew, don't spare me the details.' I ask.

‘I enjoy determined women. Someone discussion the things they want. Somebody who won't say yes because I said yes. Someone who's unafraid when you attempt new stuff,' he says. ‘I'm never afraid when you attempt something totally new, especially in regards to making something totally new in the bedroom ', I intimate ‘And I adore ladies who are direct, who cut over the chase, like you recently did. Being
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جمعه 7 تیر 1398 01:38 ب.ظ
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