PS-I is named as it:
Correct answer: B. Discovered earlier than PS-II
- A. Absorbs wavelength of 680 nm
- B. Discovered earlier than PS-II
- C. Absorbs the wavelength of 700 nm
- D. Slightly located upward than PS-II
Explanation
The correct answer is that PS-I is named so because it was discovered before PS-II. The names of photosystems are assigned based on the sequence of their discovery, not based on the wavelengths they absorb or their position within the thylakoid membrane. Option A is incorrect because PS-I absorbs approximately 700 nm, not 680 nm. Option C, while correct about the absorption wavelength, does not explain the naming basis. Option D incorrectly associates naming with spatial location, which is not a factor in naming photosystems.
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