Whether Photorespiration is present at low light intensities.

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Solution

Photorespiration only occurs under high light intensities. Therefore it also requires high temperature to occur.
And high oxygen levels are also required.
As in $C_{4}$ plants, the process doesn't occur.

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\begin{matrix} Characteristics & C3 Plant & C4 Plant & Choose from Cell type in which the & Mesophyll/ Calvin cycle takes place & Bundle sheath/ both Cell type in which the & Mesophyll/ initial carboxylation & Bundle sheath/ both reaction occurs How many cell types & Two: Bundle sheath does the leaf have & and mesophyll One: that fix C O_{2} & Mesophyll Three: Bundle sheath, palisade, spongy mesophyll Which is the primary & RuBP/PEP/PGA C O_{2} acceptor No.of carbons in the & 5/4/3 primary C O_{2} acceptor Which is the primary & PGA/OAA/RuBP/PEP primary C O_{2} fixation product No. of carbons in the & 3/4/5 primary C O_{2} fixation product Does the plant have & Yes/No/Not always RuBisCO Does the plant have & Yes/No/Not always PEP Case Which cells in the & Mesophyll/ Bundle plant have RuBisCO & sheath/ None C O_{2} fixation rate & Low/High/Medium under high light conditions Whether photorespiration & High/ negligible/ is present at low light & sometimes intensities Whether photorespiration & High/ negligible/ is present at high light & sometimes intensities Whether photorespiration & High/ negligible/ is present at low C O_{2} & sometimes concentrations Whether photorespiration & High/ negligible/ is present at high C O_{2} & sometimes concentrations Temperature optimum & {30-40}^{0} C, {20-25}^{0} C {above 40}^{0} C Examples \end{matrix}

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