Which of the following substrates is used in protoplasmic respiration?

The energy released from the ........ of glucose fulfills the energy requirements in living organisms.

Given below are two statements.
Statement $I$ - During respiration the respiratory substrate directly unite with oxygen.
Statement $II$ - The primary process of respiration consists of removal of hydrogen from the respiratory substrate.
In the light of above statements,Select the correct option given below:

Which of the following is the source of respiration?

Which of the following chemical equations represents aerobic respiration?

Which of the following reasons explain why plants do not have specialized respiratory organs?
$I-$ Each plant part takes care of its own gas exchange needs.
$II-$ There is very little transport of gases from one plant part to another.
$III-$ The rate of respiration in plants is much slower compared to animals.
$IV-$ Plants have a higher requirement for gas exchange.
$V-$ During photosynthesis,the plant's requirement for oxygen from the atmosphere increases.
$VI-$ In large,dense plants,gases can diffuse over long distances.
$VII-$ In plants,each living cell is located very close to the plant surface.