# What is quantum efficiency of PSII?

## What is quantum efficiency of PSII?

In high light: the plants have reduced amounts of the antenna complexes LHCII and CP24, the overall trapping time of PSII is only ∼180 ps, and the quantum efficiency reaches a value of 91%. In low light: LHCII is upregulated, the PSII lifetime becomes ∼310 ps, and the efficiency decreases to 84%.

What is PSII efficiency?

Photosystem II photochemical efficiency is quantified from chlorophyll fluorescence signals as the ratio of variable to maximal fluorescence (Fv/Fm), with maximal values of 0.85 equaling an 85% efficiency of the conversion of absorbed light into photochemistry.

What does a chlorophyll fluorometer measure?

Chlorophyll fluorescence appears to be a measure of photosynthesis, but this is an over-simplification. Fluorescence can measure the efficiency of PSII photochemistry, which can be used to estimate the rate of linear electron transport by multiplying by the light intensity.

### What is quenched state of chlorophyll?

It involves the quenching of singlet excited state chlorophylls (Chl) via enhanced internal conversion to the ground state (non-radiative decay), thus harmlessly dissipating excess excitation energy as heat through molecular vibrations.

What is maximum quantum efficiency?

It is defined as the number of signal electrons created per incident photon. In some cases it can exceed 100% (i.e. when more than one electron is created per incident photon).

What is effective quantum yield?

3 Quantum Efficiency and Solar-to-Hydrogen Efficiency Quantum yield, defined as the rate at which molecules undergo a given event per photons absorbed per unit time, is well known in photochemistry.

## How do you calculate chlorophyll a and b?

Total Chlorophyll (mg) in original tissue sample = Total Chlorophyll (mg/mL) x final volume (mL). Total Chlorophyll a (mg) in original tissue sample = Chlorophyll a (mg/mL) x final volume (mL). Total Chlorophyll b (mg) in original tissue sample = Chlorophyll b (mg/mL) x final volume (mL).

Is chlorophyll a?

Chlorophyll a is a specific form of chlorophyll used in oxygenic photosynthesis. It absorbs most energy from wavelengths of violet-blue and orange-red light, and it is a poor absorber of green and near-green portions of the spectrum….Chlorophyll a.

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What is quantum efficiency answer in one word?

2.3 The Quantum Efficiency and Spectral Response The quantum efficiency of a solar cell is defined as the ratio of the number of electrons in the external circuit produced by an incident photon of a given wavelength.