Oxygen in water
To demonstrate the presence of oxygen dissolved in water.
Cosa imparano gli studenti
La scienza alla base di questo esperimento
An important factor affecting germination is the oxygen concentration available to the seed. Sufficient oxygen must be present for cell respiration to provide adequate energy for germination, because germinating seeds are very metabolically active.
Respiration occurs during germination breaking down storage materials and sugars and converting them to other forms more useful to the seed.
Oxygen may be limiting in heavy soils such as clay or flooded conditions which in turn will affect seed germination. In the next experiment it will be shown how the lack of oxygen will lead germinating seeds to rot.
Attrezzatura utilizzata
- Iron stand — 5404.51
- Universal clamp — 5416.20
- Right angle clamp — 5401.16
- Glass tube 34×190 mm — 1464.51
- Glass delivery tube — 1468.02
- Rubber stopper with hole — 5450.75
- Large rubber stopper — 5450.12
- Connection for glass tube — 5449.43
- Mohr's clip — 5431.05
Sostanze chimiche e reagenti
- Acqua distillata
- Vaseline
Note sulla sicurezza
Domande per gli studenti
- Observe and try to give an explanation.
Cosa aspettarsi
<p>An evolution of some bubbles indicates the presence of air dissolved in the water.</p><p>Furthermore it indicates that the solubility of the gas depends on the pressure, as a matter of fact rising the small tube.</p>
Smaltimento
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