Observation: It is observed that evolution of bubbles from the cut ends of the plants takes place in the set-up exposed to light of variable intensity and count Number of O2 bubbles evolved in each set and record the reading. Observation table: Observations Light intensity No.of bubbles evolved per min. 1 25 W 2 60 W 3 100 W Rate of Photosynthesis = No. of bubbles formed per min per fresh plant .
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Answer:
Experiment # 1. Simple Demonstration:
Photosynthesis is a combination of biophysical and biochemical processes during which solar energy is captured and converted into chemical energy which is contained in the molecules of organic compounds. The central role of this process is in the energy cycle of life. Chemically, this process involves the uptake of CO2 which, in turn, gets converted into organic compounds, and oxygen is evolved.
The process can be measured usually by measuring the volume of CO2 consumed, or influence of CO2 conc. on the rate of photosynthesis, or volume of O2 evolved, or total amount of dry mass/grain formed. The whole process is principally dependent on light, O2, temperature and water supply from the surrounding environment.