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1) Why only hydrilla plant is used in the experiment to prove that oxygen is necessary for the photosynthesis. Because hydrilla is a small plant and hence easy to handle and also it is a aquatic plant so it is able to breath in water whereas land plants are not.
3) A gas evolution reaction is a chemical reaction in which one of the end products is a gas such as oxygen or carbon dioxide. Gas evolution reactions may be carried out in a fume chamber when the gases produced are poisonous when inhaled or explosive.
Sorry dear i don't know answer of 2nd question
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