Which of the following statements must be true in order for atp synthase present in chloroplasts to function properly?
a. the ph of the stroma must be lower than the ph of the thylakoid lumen
b. the ph of the stroma must be higher than the ph of the thylakoid lumen
c. there must be no difference in ph between the stroma of the chloroplast and the thylakoid lumen

b. the pH of the stroma must be higher than the pH of the thylakoid lumen

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]