If a cell contains more than one respiratory substrate,which respiratory substrate is used first?

Which of the following substrates is used in protoplasmic respiration?

$A$ process is occurring throughout the day in '$X$' organism. Cells are participating in this process. During this process $ATP, CO_2,$ and water are evolved. It is not a light-dependent process. Name the process.

Differentiate between aerobic respiration and anaerobic respiration.

The Pasteur effect is concerned with the shifting of environmental conditions from

Which of the following is produced during respiration?