91.

In which one of the following steps of citric and cycle FAD⁺
is reduced to FADH₂?

• Pyruvate $\to$ Acetyl coenzyme A

• Succinic acid $\to$ Malic acid

• Malic acid $\to$ Oxaloacetic acid

• Citric acid $\to$ $\mathrm{\alpha }$ – Ketoglutaric acid

• Citric acid $\to$ $\mathrm{\alpha }$ – Ketoglutaric acid

Tidal Volume and Expiratory Reserve Volume of an athlete is 500 mL and 1000 mL, respectively. What will be his Expiratory Capacity if the Residual Volume is 1200 mL?

• 1700 mL

• 2200 mL

• 2700 mL

• 1500 mL

Respiratory Quotient (RQ) value of tripalmitin is

• 0.7

• 0.07

• 0.09

• 0.9

Due to increasing air-borne allergens and pollutants, many people in urban areas are suffering from respiratory disorder causing wheezing due to

• inflammation of bronchi and bronchioles

• proliferation of fibrous tissues and damage of the alveolar walls

• reduction in the secretion of surfactants by pneumocytes.

• benign growth on mucous lining of nasal cavity

0n high mountains, difficulty in breathing is due to

• decrease in partial pressure of O₂

• decrease in amount of O₂

•  increase in CO₂ concentration

• all of the above