The diagram shows a cross-section of part of a leaf. How does the oxygen content of the air at X compare with normal atmospheric air when the leaf is in the light and when it is in the dark?
- Ain the light: higher; in the dark: lower
- Bin the light: higher; in the dark: the same
- Cin the light: lower; in the dark: higher
- Din the light: lower; in the dark: the same