3. Arrange an experimental set up as shown in the figure. Observe the difference in the evolution of gas when sunlight falls directly and indirectly and write your inferences in the Science diary.
Answers
To prove that oxygen is evolved in green plants during photosynthesis.
To prove that oxygen is evolved in green plants during photosynthesis. (b) If this apparatus is kept in darkness, the gas bubbles are not released showing that the light is one of the essential factors for the photosynthesis in the case of water plants and there is no production of oxygen without it.
To prove that oxygen is evolved in green plants during photosynthesis. (b) If this apparatus is kept in darkness, the gas bubbles are not released showing that the light is one of the essential factors for the photosynthesis in the case of water plants and there is no production of oxygen without it. (c) Priestly hypothesized that "plants restore the air whatever breathing animals and burning candles remove" i.e., plants restore oxygen which animals remove by breathing or candles by burning. During photosynthesis, plants utilize carbon dioxide and release oxygen.
To prove that oxygen is evolved in green plants during photosynthesis. (b) If this apparatus is kept in darkness, the gas bubbles are not released showing that the light is one of the essential factors for the photosynthesis in the case of water plants and there is no production of oxygen without it. (c) Priestly hypothesized that "plants restore the air whatever breathing animals and burning candles remove" i.e., plants restore oxygen which animals remove by breathing or candles by burning. During photosynthesis, plants utilize carbon dioxide and release oxygen. Van Neil's experiments with chemoautotrophs show that evolution of oxygen is from water and does not come from carbon dioxide as earlier thought. This is evident from formation of metabolic water and sulphur during bacterial photosynthesis without water being a substrate.