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کلاس پنجم - چطور گیاهان تنفس میکنند؟
کلاس پنجم
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چطور گیاهان تنفس میکنند؟

همان طور که میدانیم، همه موجودات زنده، از جمله گیاهان، به اکسیژن نیاز دارند که برای به دست آوردن آن ،تنفس میکنند.بیشتر گیاهان، هوا را از طریق منافذ ریزی که بر روی برگ ها وجود دارند دریافت میکنند. این منافذ ریز در زیر برگ ها قرار دارند. پس تنفس گیاهان از راه روزنه های برگ های آنها انجام میگیرد. هوا از این روزنه ها وارد گیاه می شود و گیاه هم، اکسیژن این هوا را میگیرد یعنی تنفس میکند.
یک گیاه سبز برای ساختن غذا نیز باید هوا را به درون خودش وارد کند.

هوا همچنین ازبین این منافذ خارج میگردد. هوای خارج شده دارای گازهایی از هوا میباشد که مورد استفاده گیاه قرار نگرفته است.

این هوا امکان دارد دارای اکسیژن اضافی نیز باشد. زیرا یگ برگ سبز، وقتی  که در حال ساختن غذاست، اکسیژن نیز پس میدهد. هوا در تمام مواقع از میان این منافذ داخل و خارج میگردد.







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یکشنبه 19 اردیبهشت 1395
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