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Vai jūs varētu atbildēt uz maniem jautājumiem?
kas ir kopīgs visām augu lapām? vai tie nevarētu būt hloroplasti? un kāpēc augu sēklas ilgstoši saglabā dīgtspēju? Jau iepriekš paldies.
13, 2006, 18:08Rincis
:-:

    Ja pirmais jautājums ir tieši par lapām, tad pareizu variantu ir bezgala daudz
    - lapas sastāv no šūnām, fotosintezējošās šūnas satur hloroplastus,
    hloroplasti satur hlorofilu, lapu šūnas elpo, visām lapām ir atvārsnītes utt.
    Sēklas ilgstoši saglabā dīgstspēju tāpēc, ka tajās ir rezerves barības vielas, tās
    ir aizsargātas no vides nelabvēlīgās ietekmes, liela daļa sēklu var paciest
    izžūšanu līdz gaissausam stāvoklim, tām ir miera periods - sēklas nedīgst,
    kamēr nonāk specifiskos apstākļos... Nav vienas atbildes, tāpat, kā uz pirmo
    jautājumu.
    13, 2006, 18:52Ģederts

    Cik tad ilgi sēklas var saglabāt dīgtspēju?
    2, 2007, 16:44Pēcis
[Your answers and comments can be added here]

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