During the day, the pH of the stroma is higher than the thylakoid lumen.
pH is defined as the potential of hydrogen. It is the measure of the acidity of basicity of any substance. pH ranges from a scale of 0-14. O is the most acidic value while 14 is the most alkaline value. The neutral pH of any compound is 7.
Thylakoid is the sac like structure present inside the chloroplast of plant cells. It is the location where the light reactions of the photosynthesis occurs. The thylakoids arrange themselves in a coin like stack called grana. The various thylakoid are connected to each other by the help of stroma lamellae.
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