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Elaine asked in 科學及數學生物學 · 1 decade ago

中三bio問題

Detection of oxygen produced from photosynthesis

1. put a few Hydrilla plants in a beaker of dilute sodim hydrogencarbonate solution.

2. Put an inverted filter funnel on three stoppers to cover the plants.Put a test tube completely filled with dilute sodium hydrogencarbonate solution on top of the funnel.

3. Leave the set up in bright light.

4. Carry out the glowing splint test with the gas collected.

點解要用sodim hydrogencarbonate solution?

3 Answers

Rating
  • 1 decade ago
    Favorite Answer

    Absorb CO2.

    The aim of the experiment is to detect Oxygen produced from phototosyntheis.

    In order not to affected by CO2, sodium hydrogencarbonate is added to absorb CO2. Therefore the rate of photosynthesis is not affected. Oxygen is produced during the process of photosynthesis.

    Source(s): my biology knowledge
  • Anonymous
    10 years ago

    shireenhosh 講得岩,

    個experiment 就係要maintain constant rate of photosynthesis.

    所以先要constant supply of CO2

    NaHCO3 放CO2 以達至呢個效果,

    先可以有constant measurment of O2 given out by the Hydrilla

    2011-11-20 13:18:27 補充:

    再者, CO2 大部份都會溶係水, 升出黎既gas bubbles 大部分都係hydrilla 放出黎既O2

    所以CO2 更加唔會影響到個measuring result

    CO2:: 大部分比hydrilla 吸左做photosynthesis, 少部分放出黎既都溶埋入水

  • 1 decade ago

    sodim hydrogencarbonate solution係用黎release CO2!!!!!

    如果sodim hydrogencarbonate solution係for absorb

    CO2,感仲有CO2去carry out photosynthesis咩!

    你要有CO2先可以carry out photosynthesis then produced oxygen,

    E 個就係成個experiment ge aim.

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