Science MCQs

The epiglottis covers the trachea during swallowing to prevent choking.

Alveoli are the sites of gas exchange in the lungs.

The diaphragm contracts and flattens during inhalation increasing chest volume.

Cellular respiration produces carbon dioxide as a waste product.

Respiration uses oxygen to break down food molecules releasing energy.

Common cold is a viral infection of the upper respiratory tract.

Pneumonia is an infection that inflames the air sacs in one or both lungs.

Vitamins from fruits and vegetables help keep the lungs healthy.

Smoking is the primary risk factor for lung cancer.

Dietary fibre adds bulk to stool and helps it pass easily.