question_answer 71)

  "All plants give out oxygen during day and carbon dioxide during night". Do you agree with this statement? Give reason.

Answer:

                  Yes, the statement is correct. Plants respire throughout the day, while photosynthesis takes place only in the presence of sunlight. In daytime, CO2produced during respiration is used by the plants in photosynthesis. So, CO2 is not released into the environment. The oxygen produced during photosynthesis, is released into air through stomata. At night, when there is no photosynthesis, no oxygen is released. Also, CO2 produced during respiration is not used by the plants. So, it is released in the air.