Respiration in Plants - Online Test

Q1. At the end of citric acid cycle, most of the energy is transferred to
Answer : Option D
Explaination / Solution:

Citric acid cycle or  start with pyruvate and leads to complete oxidation of glucose to carbon dioxide and energy in form of ATP, NADH and .

At end of citric acid cycle, most of the energy is transferred to NADH and .


Q2. In eukaryotic organisms aerobic respiration takes place in presence of
Answer : Option C
Explaination / Solution:

Aerobic means “with air”. This type of respiration needs oxygen for it to occur so it is called aerobic respiration.

The word equation for aerobic respiration is:

Glucose + Oxygen  Carbon dioxide + Water + Energy

The chemical equation is:

C6H12O6 + 6O 6CO2 + 6H2O + 2900 kJ/mol


Q3. Electron transport system take place in
Answer : Option B
Explaination / Solution:

The metabolic pathway through which the electron passes from one carrier to another, is called the ETS and it is present in the inner mitochondrial membrane.

Q4. Arrange the following in descending order based upon number of carbon atoms in Kreb cycle a) α-ketoglutaric acid b) citric acid c) Acetyl coA d) Succinic acid
Answer : Option C
Explaination / Solution:

In kerb cycle citric acid consists of 6C atoms ,α-ketoglutaric acid consist of 5C atoms, succinic acid consists of 4 C atoms and Acetyl co A consists of 2C atoms,

Q5. Which compound consists of 5 carbon atoms?
Answer : Option B
Explaination / Solution:

Alpha-ketoglutaric acid is an important biological compound and is a key intermediate in the Krebs cycle. Alpha-ketoglutaric acid occurs naturally within cells.

One of its functions is to combine with ammonia to form glutamic acid and then glutamine. Another function is to combine with nitrogen released in the cell, therefore preventing nitrogen overload.


Q6. In electron transport system, the two copper centres are found in
Answer : Option C
Explaination / Solution:

The enzyme cytochrome c oxidase or Complex IV,is a large transmembrane protein complex found in bacteria and the mitochondrion of eukaryotes. The complex contains two hemes, a cytochrome a and cytochrome a3, and two copper centers, the CuA and CuB centers. The cytochrome a3 and Cu​​​B form a binuclear center that is the site of oxygen reduction.

Q7. The complex V is also known as
Answer : Option B
Explaination / Solution:

complex V or ATP synthase can be separated into 2 parts:

Fo - the portion embedded in the inner mitochondrial membrane and

F1-ATPase — the portion projecting into the matrix of the mitochondrion. This

 is why the intact ATP synthase is also called the FoF1-ATPase.


Q8. The cytochrome c moves in between
Answer : Option D
Explaination / Solution:

Cytochrome c is a small protein attached to the outer surface of the inner membrane and acts as a mobile carrier for transfer of electrons between complex III and IV.

Q9. In electron transport system, the oxidation of one molecule of NADH produces
Answer : Option B
Explaination / Solution:

Oxidation of one molecule of NADH gives rise to 3 molecules of ATP, while that of one molecule of  produces 2 molecules of ATP.

Q10. The TCA cycle starts with
Answer : Option D
Explaination / Solution:

The TCA cycle starts with the condensation of acetyl group with oxaloacetic acid (OAA) and water to yield citric acid.