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The C-4 plants are photosynthetically more efficient than C-3 plants because

  • the CO2 compensation point is more

  • CO2 generated during photorespiration is trapped and recycled through PEP carboxylase

  • the CO2 efflux is not prevented¬†

  • they have more chloroplasts

Answer

D.

they have more chloroplasts

Chloroplasts in bundle sheath cells are larger and always contain grana whereas chloroplasts in mesophyll cells are smaller. The C4 - plants are photosynthetically more efficient than c3 -plants because they more chloroplasts.

Chloroplasts in bundle sheath cells are larger and always contain grana whereas chloroplasts in mesophyll cells are smaller. The C4 - plants are photosynthetically more efficient than c3 -plants because they more chloroplasts.