7th Class
Science
Respiration in Organisms
Question Bank
Respiration In Plants And Animals
question_answer
DIRECTIONS: Read the passage(s) given below and answer the questions that follow. Passage - 4 Lungs are present in chest cavity. This cavity is surrounded by ribs on the sides. A large muscular sheet called diaphragm form the floor of the chest cavity. Percentage of oxygen in inhaled air is ____ in exhaled air.
A)less than
B)more than
C)same as
D)cannot say
Correct Answer:
B
Solution :
In inhaled air percentage of oxygen is 21 % as compared to 0.04 % in exhaled air.