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1:Plants give out carbon dioxide not only at night but during the day too. It happens because of the process of respiration in which plants take in oxygen and give out carbon dioxide. As soon as the sun rises another process called photosynthesis starts, in which carbon dioxide is taken in and oxygen is given out
2:The veins of a leaf have double pipeline tubes because they consists of xylem and phloem which help in the transportation of water and food respectively. The leaves which are green, are so because they contain a green coloured pigment called chlorophyll.
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