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BIOLOOGIA RIIGIEKSAMITE ÜLESANDEID

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3.19. Uuritakse temperatuuri mõju pärmseente elutegevusele. 6 punkti<br />

1. Glükoosi lahus kuumutatakse, jahutatakse ja valatakse kolbi.<br />

2. Lisatakse pärmseened.<br />

3. Lahus kaetakse õhukese õlikihiga.<br />

4. Teatud aja möödudes loendatakse minutis eralduvate süsihappegaasi mullide arv.<br />

5. Katset korratakse erinevatel temperatuuridel.<br />

Selgitage, miks kaetakse katses lahus õliga.<br />

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Katsetulemused on esitatud alljärgnevas tabelis.<br />

Temperatuur (◦ C) Süsihappegaasi mullide arv minutis<br />

4 0<br />

20 8<br />

30 22<br />

40 6<br />

50 0<br />

Tehke järeldus, kuidas sõltub käärimise intensiivsus temperatuurist.<br />

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Milline aine tekib katses veel peale süsihappegaasi?..........................................................<br />

Selgitage, miks 50º juures ei eraldu enam süsihappegaasi.<br />

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