Question

During the process of aerobic respiration, $(i)$ gets oxidised and its electrons get transferred to the electron transport chain while in photosynthesis, $(ii)$ gets oxidised to transfer molecules to the electron transport chain.

• A. $(i)$-glucose; $(ii)$-xanthophyll
• B. $(i)$-carbon dioxide, $(ii)$ - xanthophyll
• C. $(i)$-carbon dioxide, $(ii)$-chlorophyll-a
• D. $(i)$-glucose, $(ii)$-chlorophyll-a

Answer 1

Answer: (D)

The oxidative breakdown of respiratory substrates with the help of atmospheric $O_2$ is known as aerobic respiration. It involves complete breakdown of substrates into $CO_2$ and water, releasing energy. For example, the simple chemical equation for aerobic breakdown of glucose is
$C_6H_{12}O_6 + 6O_2 \to 6CO_2 + 6H_2O + 2870 \,kJ/686 \,KCal$
While during photosynthesis chlorophyll a gets oxidised to transfer molecules to the electron transport chain.