Question

During deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic acid in the

• A. cytoplasm
• B. chloroplast
• C. mitochondria
• D. Golgi body

Answer 1

The correct option is A

cytoplasm

The correct option is A.

Explanation of the correct option:

1. The end product of glycolysis is pyruvate.
2. In the absence of oxygen, pyruvate forms lactic acid.
3. This is called anaerobic respiration.
4. It occurs in the cytoplasm.
5. When a person does rigorous exercises he lacks oxygen.
6. At this time the muscle cells produce lactic acid.

Explanation of the incorrect option:

Option B:

1. The chloroplast helps in photosynthesis in plants.
2. The chlorophyll pigment in it captures the solar energy.
3. It also provides immunity to plants.

Option C:

1. The lactic acid deposits in the muscle.
2. It then transfers into the mitochondria.
3. In the mitochondria, the lactic acid degrades.
4. The lactic acid forms hydrogen ion and lactate.
5. Lactate is utilized by mitochondria.
6. The hydrogen ion again deposits in the muscle.
7. It causes difficulty in muscle contraction and muscle fatigue.

Option D:

1. Golgi bodies are sac-like structures.
2. They are present in the cytoplasm.
3. They transport the lipids and protein to different target cells.
4. The Golgi body forms the acrosome of the sperm.

Final answer: During deficiency of oxygen in the tissues of human beings, pyruvic acid is converted into lactic acid in the cytoplasm.