Practice MCQ Questions and answers on Biology-GK

Photosynthesis absorbs energy from sunlight to build carbohydrates in the chloroplasts, and aerobic cellular respiration releases that stored energy by using oxygen to break down carbohydrates.

Mucus has a pretty important job — it keeps the lining of your nose moist and warms the air you breathe. Mucus also protects the lungs. When you breathe in air through your nose, it contains lots of tiny things, like dust, dirt, germs, and pollen.

Precentage of CO₂ found in exhaled air is 0.04.

Muscles get tired when there is shortfall of ATP.

Cellular respiration is best associated with the organelle mitochondrion.

Slow oxidative muscle fibers are best suited for running a marathon.

The lungs are located in thoracic cavity.

In general, the main energy source for cellular metabolism is glucose, which is catabolized in the three subsequent processes—glycolysis, tricarboxylic acid cycle (TCA or Krebs cycle), and finally oxidative phosphorylation—to produce ATP.

The lungs are surrounded by two membranes, the pleurae. The outer pleura is attached to the chest wall and is known as the parietal pleura; the inner one is attached to the lung and other visceral tissues and is known as the visceral pleura.
So, the correct answer is option C.

The accumulation of lactic acid is the main reason for the formation of cramps in sprinters.