24. (Note: 1 [s 1 Einsteins 1 Mol.) Imagine we measured two plants (plant A and
ID: 3509206 • Letter: 2
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24. (Note: 1 [s 1 Einsteins 1 Mol.) Imagine we measured two plants (plant A and plant B) in ambient light level of 500 E m-2 s, using the MultisynQ instrument, and, we got the following results: For plant A, " = 0.75, NPS = 0.15; and for plant B ,-0.70, NPs* 0.20, which plant is, in order to protect its photosystem, actively diverting more of the light energy away from photosynthetic electron transport and into xanthophyll pigments? A. Plant A B. Plant B 25. Now, imagine that you took the same plants as given in the previous questions and measured them with the MultisynQ but at a higher light level of 1000 E m-2 s-1. This time, your results are: For plant A, " = 0.50, ":0.30, and for plant B ,-0.55, No = 0.25. which plant is apparently suffering more damage due to the change to high light? A. Plant A B. Plant BExplanation / Answer
Xanthophyll cycle play a key role in actively diverting light energy away from the photosynthetic centres in case of high intensity light. It thus prevents the stress due to excess light on the plant. The mechanism is known as non-photochemical quenching or non-photochemical system (NPS). Photosystem II is the protein required in light-dependent reactions of oxygenic photosynthesis. The enzymes of the photosystem capture photons of light to energize electrons that are then transferred to the photosynthetic centers.
Answer 24:- Plant B
Plant A-
The ratio of Photochemical quenching (II) to non-photochemical quenching (NPS) = 0.75 : 0.15.
Plant B:-
The ratio of Photochemical quenching (II) to non-photochemical quenching (NPS) = 0.70 : 0.2.
Thus, Plant B is actively diverting more of the light energy away from the photosynthetic electron transport and into the xanthophyll pigment.
Answer 25:- Plant B
High intensity of light can harm plants. The toxicity of high intensity of light is targeted to the photosystem II and leads to damage and degradation of the reaction center. The degradation the important reaction center disrupts photosystem II that involve highly oxidizing radicals and toxic oxygen species.
Plant A-
The ratio of Photochemical quenching (II) to non-oxidative quenching (NO) = 0.5 : 0.3.
Plant B:-
The ratio of Photochemical quenching (II) to non-oxidative quenching (NO) = 0.55 : 0.25.
Thus, Plant B is suffering more damage, as more of the light energy is affecting the photosystem II (II).
(II).
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