alleryC4 plants lack photorespiration because
APhotorespiration is light-dependent only
BC4 plants have no light reactions at all
CBundle sheath cells concentrate CO2 around RuBisCO
DRuBisCO is absent in C4 plants altogether
Answer & Solution
Correct answer: C. Bundle sheath cells concentrate CO2 around RuBisCO
C4 plants use PEP carboxylase in mesophyll to grab CO2 and shuttle it as malate/aspartate to bundle sheath cells, where it is released as concentrated CO2 around RuBisCO.
High CO2:O2 ratio suppresses oxygenase activity.
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