Results from lack of specificity of rubisco.
a. photorespiration
b. mitochondrial respiration
c. both

a. Photorespiration

Explanation:

Photorespiration is the metabolic process that results from Rubisco's lack of specificity (O 2 consumption and light-related CO 2 production)

Photorespiration occurs due to the double activity exerted by the enzyme ribulose-1,5-bisphosphate carboxylase / oxygenase (rubisco), which catalyzes two competing reactions: the addition of CO2 to ribulose-1,5-bisphosphate (RuBP), forming two molecules of 3-phosphoglycerate (PGA), which are used in the thermochemical step of photosynthesis and the addition of O2 to RuBP, producing a PGA and a phosphoglycolate molecule, characterizing photorespiration.

Thus, the rubisco, present in chloroplasts, besides exerting the carboxylase activity, which initiates the Calvin cycle, is equally capable of exerting oxygenase activity, having both RuBP as substrate in both cases.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.