Biological Processes 1 Grade 8 Science Week 4 Session 1

What is the main purpose of breathing in humans?

• To produce carbon dioxide

• To inhale oxygen and exhale carbon dioxide

• To release energy without oxygen

• To filter harmful gases from the air

Which part of the body helps in the breathing process by moving during inhalation and exhalation?

• Heart

• Lungs

• Diaphragm

• Ribs

The process of breaking down food using oxygen to produce energy is called:

• Respiration

• Digestion

• Photosynthesis

• Excretion

What is the average rate of respiration in humans?

• 5-10 breaths per minute

• 15-28 breaths per minute

• 30-40 breaths per minute

• 60-70 breaths per minute

Which of the following gases is inhaled during respiration?

• Carbon dioxide

• Nitrogen

• Methane

• Oxygen

During inhalation, what happens to the diaphragm and ribcage?

• Diaphragm moves upward, ribs move inward

• Diaphragm remains still, ribs move outward

• Diaphragm moves downward, ribs move outward

• Diaphragm moves downward, ribs remain still

Which of the following is a key takeaway from the process of respiration?

• The diaphragm helps in the movement of air in and out of the lungs

• The body gets rid of nitrogen through exhalation

• Photosynthesis occurs in the lungs

• Energy is produced without the use of oxygen