Question

Given below are two statements:
Statement (I): In aerobic respiration, hydrogen removed from respiratory material combines with oxygen to form water.
Statement (II): Removal of hydrogen from respiratory materials is the primary process in respiration.
In light of the above statements, choose the most appropriate answer from the options given below.

• A. Both Statement (I) and Statement (II) are correct.
• B. Both Statement (I) and Statement (II) are incorrect.
• C. Statement (I) is correct but Statement (II) is incorrect.
• D. Statement (I) is incorrect but Statement (II) is correct.

Hint:

Respiration oxidises substrates mainly by removing hydrogen, which finally combines with oxygen to form water.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept
Biological oxidation of respiratory substrates takes place mostly by removal of hydrogen (dehydrogenation).

Step 2: Statement (I)
Hydrogen taken from the substrate is carried by \(\text{NAD}^{+}\) and FAD to the electron transport chain.
There it finally combines with oxygen to form water. This is correct.

Step 3: Statement (II)
Stepwise removal of hydrogen by dehydrogenase enzymes is the main event that releases energy in respiration. This is correct.

Final Answer:
Both statements are correct. \[ \boxed{\text{(A) }\text{Both Statement (I) and Statement (II) are correct.}} \]