Breathing is the process of moving air out and in the lungs to facilitate gas exchange with the internal environment. Cells use oxygen to break down sugar and obtain energy. The involuntary reflex of opening one's mouth wide and inhaling deeply is due to tiredness. We yawn in the following conditions: When there is a lack of oxygen supply to the brain, then the brain induces a yawn. When a person is tired, he or she will not breathe properly. So, the oxygen intake will be low, then we yawn. And that will help to bring back more oxygen into the blood and releases the carbon dioxide out of the blood.

EUREKA PLUS Revised Bringing Science to Life>Chapter 10 - Respiration in Organisms>EXERCISES>Q 2

HARD

7th CBSE

IMPORTANT

Earn 100

Differentiate between exhalation and inhalation.

Important Questions on Respiration in Organisms

HARD

7th CBSE

IMPORTANT

EUREKA PLUS Revised Bringing Science to Life>Chapter 10 - Respiration in Organisms>EXERCISES>Q 3

How does the air that we breathe in reach the lungs?

HARD

7th CBSE

IMPORTANT

EUREKA PLUS Revised Bringing Science to Life>Chapter 10 - Respiration in Organisms>EXERCISES>Q 4

How is the carbon dioxide removed out of the human body?

HARD

7th CBSE

IMPORTANT

EUREKA PLUS Revised Bringing Science to Life>Chapter 10 - Respiration in Organisms>HIGHER ORDER THINKING SKILLS>Q 1

Separate the following as animals with gills, animas with lungs and animals with spiracles.

Bat, tree snake, prawn, butterfly, turtle, bee, crab, dragon fly, leopard, dog, sea snake, shell fish, ant, ladybird beetle, lobster, hermit crab, crocodile, koala bear, rat snake, flying fish, shark.