Question

what is red drop and emersion effect​

Answer 1

Explanation:

This phenomenon is known as Emerson enhancement effect or often as Emerson effect. These puzzling phenomena of red drop and enhancement effect led to the conclusion that two different reaction centers or photochemical events are involved in photosynthesis. One event is driven by red light (= 680 nm) and the other driven by far-red light (>680 nm).

Answer 2

Answer:

The sharp decline in photosynthetic efficiency as the wavelength of exciting light enters the red region (above 680nm) due to the insensitivity of photosystem II to excitation by red light.