What is proton gradient ?

Proton gradient is the establishment of concentration difference of protons across a semipermeable membrane which helps in the synthesis of ATP both in respiration and photosynthesis.
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why is RuBP enzyme also called as RuBisCO ?

RuBP enzyme also has oxygenation activity thus iit is also called as RuBP carboxylase-oxygenase or RuBisCO.
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Why does photosynthesis decrease under very high light intensity ?

Photosynthetic rate decreases under high intensity of light because of

(1) photo-oxidation of enzymes, pigments and other chemicals.

(2) photo-inhibition due to dehydration and closure of stomata.

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What is quantum yield ?


The number of oxygen molecules produced per quantum of light absorbed is called quantum yield.
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What is quantum ?

The energy possessed by an individual photon is known as quantum.
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