#Question id: 10206
#Unit 6. System Physiology – Plant
The excess energy is absorbed by three carotenoids molecules such as violaxanthin, antheraxanthin, and zeaxanthin, which of the following statements correct about these molecules?
#Question id: 10207
#Unit 6. System Physiology – Plant
In high light, violaxanthin is converted into zeaxanthin, via the intermediate antheraxanthin by the enzyme known as
#Question id: 10208
#Unit 6. System Physiology – Plant
The large amounts of energy absorbed by the pigments if this energy cannot be stored by photochemistry, this is why a protection mechanism is needed Protection against photodamage is a multilevel process what role does the first line of defense play to suppress from damage?
#Question id: 10209
#Unit 6. System Physiology – Plant
Protection against photodamage is a multilevel process, excited state of chlorophyll is not rapidly quenched by photochemistry it can react with molecular oxygen to form toxic photoproducts such as as singlet oxygen (1 O2*) what can damage if this second line of defense also fails to eliminate the reactive photoproducts?
#Question id: 10210
#Unit 6. System Physiology – Plant
Some xanthophylls also participate in energy dissipation such as in light conversion of Violaxanthin to Zeaxanthin with antheraxanthin as the intermediate and vice-versa, which of the following statements is CORRECT?
a.) The conversion of Violaxanthin to Zeaxanthin a singlet oxygen is removed with the help of co-factor Ascorbate and violaxanthin de-epoxidase under high PPFD
b.) Zeaxanthin is oxidised into violaxanthin with the help of NADPH and oxygen under low PPFD
c.) Conversion of Violaxanthin to Zeaxanthin a singlet oxygen is removed with the help of NADPH and water under low PPFD
d.) Zeaxanthin is oxidised into violaxanthin in presence of enzyme known as violaxanthin de-epoxidase and co-factor Ascorbate under high PPFD
#Question id: 10211
#Unit 6. System Physiology – Plant
Which of the following mechanism is not involve in phtoprotection to plants?