Question

A potted plant was kept in the dark for two days.After that a stalk of leaves was taken from the plant.It was then placed in a bell jar containing a mixture of gases X and Y in equal volumes.This experiment set up was exposed to bright light for a period of time. Give reasons how the volume of gas X decreased while the volume of Y increased.How will the leaves show the result when tested with iodine solution. ​

Answer 1

Answer:

x gas is CO2 any Y gas is O2.Photosynthesis will occure in bright sunlight. This is the reason the volume of X gas decreased.The leaves turns blue black when tested with iodine solution.

Answer 2

X gas is $O_{2}$ and Y gas is $CO_2$. The leaves will turn blue-black when tested with iodine solution.

• When the plant is exposed to bright light, photosynthesis occurs. Hence, the Oxygen levels in the bell jar increases while Carbon Dioxide levels decrease.
• The phenomena mentioned above happen because during photosynthesis, the plant takes in $CO_2$ and the by-product of the process is $O_2$ which the plant releases.  
• The leaves turn blue-black when tested with Iodine solution because there is a presence of starch, which is the food prepared by the plants through photosynthesis.  

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