Jane filled one transparent bottle and one brown bottle of the same capacity with pond water. She kept the first bottle in sunlight and the second in dark. After one hour she calculated the amount of oxygen present in both the bottles. What will be her observation?

Most likely, the brown bottle will have a lower oxygen concentration than the transparent bottle. This is because in the brown bottle light cannot penetrate well so there will be less activity inside the bottle by the organisms inside while the transparent will have higher activity since light can easily pass through which is needed in the process of photosynthesis.