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A04 Earth worms and plants also need respiration
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* Left: You have learned
by the previous experiment that lime water will
only turn milky by consumed air. Carbon dioxid is formed by respiration,
lime water indicates it by getting a white colour.
Experiment:
* Middle: Place
an earth worm on humid tissue paper in a 50-ml
infusion bottle.
* Right: Do
the same with germinating barley in a second bottle.
* Close the bottles
by stoppers pierced by a needle (for air supply) and a tubing to suck consumed
air through a 5 ml injection bottle with 2 ml lime water.
Observation
and
explanation:
The lime
water turns milky indicating that the worm and the barley produced
carbon
dioxide during respiration.