Describe an experiment to prove that Carbon dioxide is essential for photosynthesis. Draw its labelled diagram. | web4study

Describe an experiment to prove that Carbon dioxide is essential for photosynthesis. Draw its labelled diagram.



Is carbon dioxide needed for Photosynthesis?

Keeping them in a dark room detaches two carbon plants. They are watered properly during this period. Each pot is enclosed in a transparent polythene bag as shown in the figure.

A Petri dish containing soda lime (potassium hydroxide) is placed in one of the pots to a absorb any carbon dioxide present in the polythene bag. In the other pot, a Petri dish is placed containing sodium bicarbonate solution, which would produce carbon dioxide.

The plants are then left in light for several hours. A leaf from each pot is detached and tested for starch. The leaf from the pot containing soda lime does not turn blue; soda lime had absorbed any carbon dioxide present in the bag.

The leaf from the other pot where carbon dioxide was being released by the sodium bicarbonates solution turns blue indicating the presence of starch. These results show that carbon-dioxide is essential for photosynthesis. 

carbon dioxide needed for Photosynthesis

 


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