Multiple choice

Red drop and Emerson effect have proved the existence of

  1. Light and dark reactions in photosynthesis

  2. Two distinct photosystems in photosynthesis

  3. The supply of electrons from oxygen evolving complex

  4. Electron transport from water to NADP+ across thylakoids
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Red drop (decrease in photosynthetic efficiency at wavelengths >680 nm) and Emerson enhancement effect (greater than additive photosynthesis when beams of 680 nm and shorter wavelengths are combined) demonstrated existence of two photosystems working in series-PSII and PSI.

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