Carbon dioxide, of course. Starch is a polymer of glucose.
Plants need carbon dioxide gas to carry out photosynthesis, a process where they use sunlight to convert carbon dioxide and water into glucose (sugar) and oxygen. This process is essential for the plant's growth and survival.
Starch is not a gas, it is a carbohydrate composed of glucose monomers. It is a solid.
Carbon Dioxide
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I don't think it is a gas when inside the plant, but most animals/plants need it.
Oxygen
A plant takes in carbon dioxide stores the carbon then releases oxygen as a waste gas.
Chlorine gas turns moist starch iodide paper blue-black.
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Iodine is purple.As a gas iodine is approx. violet or purple, as solid is very brown.Brown if no starch on plant. Dark blue if there is starch on plant.
Typically, a 10% starch solution is used for H2S gas analysis with iodine. The starch solution acts as an indicator by forming a blue-black complex with iodine in the presence of H2S gas, allowing for easy detection of the gas.
The gas is carbon dioxide.