No, releasing carbon dioxide and taking in oxygen during the day does not necessarily mean photosynthesis is absent. It simply indicates that the rate of respiration is higher than the rate of photosynthesis at that particular time. During the day, both processes occur simultaneously, with respiration producing CO2 and photosynthesis utilizing it.
Elaboration:
Photosynthesis:
During the day, plants use sunlight to convert CO2 and water into glucose (a type of sugar) and release oxygen as a byproduct.
Respiration:
Plants also respire, breaking down glucose to release energy for their cellular functions. This process consumes oxygen and produces CO2.
Simultaneous Processes:
Both photosynthesis and respiration occur simultaneously during the day.
Net Effect:
If photosynthesis is occurring at a faster rate than respiration, the net effect is the release of oxygen and the consumption of CO2.
Variable Rates:
The rates of photosynthesis and respiration can fluctuate depending on factors like light intensity, temperature, and the plant’s energy needs. If respiration temporarily outpaces photosynthesis, a plant may release CO2 and take in oxygen.
Nighttime:
At night, when there is no sunlight, photosynthesis ceases, and respiration continues, resulting in the release of CO2 and the intake of oxygen.