Practical Work:
Demonstration of Photosynthesis
The phenomenon pf photosynthesis can be demonstrated by using an aquatic plant like Hydrilla.You know that in the process of Photosynthesis, oxygen gas is evolved as a by-product. So release of oxygen from a set up would provide an evidence of photosynthesis.
Problem:Dose hydrilla carry out photosynthesis when provide by all the essential factors?
Hypothesis:Hydrilla is an aquatic plant that carries out photosynthesis using CO2 and water and release oxygen at the same time.
Deduction:RElease of O2 from the plant body wuld be a proof of photosynthesis.
**Material required: Fresh hydrilla branches, 500 ml beaker, funnel, test tube, potassium bicarbonate,match box water tub.
Background information: Carbon dioxide and water are the raw materials for photosynthesis. When potassium bicarbonate is dissolved in water it is ionized into carbonate and hydrogen ions. The carbonate ions release carbon dioxide.
Producers:
1. Fill About half of the 500-ml bearker wiht water.
2. Take some fresh branches of hydrilla and place in the broader side of a funnel and set the funnel as shown in Figure 7.7.
3. Put an inverted test tube on the tubular part of the funnel. (Perform step 1,2 and 3 by putting all the apparatus in a water tub so that no extrernal air would enter the test tube. After step 3, bring the set-up out of water tub.)
4.Put some quantity of potassium bicarbonate in the water off beaker.
5. Put all the set up in light and observe.
Experiment set up for the Demonstration of Photosynthesis.
Sources of Photo
All data collected from my book of Science.