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Consider the following statements regarding photosynthesis and respiration in plants and select the correct option I) RuBisCO has high affinity to oxygen in low $CO_2$ concentration II)The Calvin pathway occurs in the chloroplast of bundle sheath cells of $C_4$ plants III) Yeast poison themselves when the concentration of alcohol reaches $7\%$ IV) Oxygen is a final hydrogen acceptor during aerobic respiration
In the below diagram, identify the part which connects the peripheral microtubules to the central sheath.