EASY
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The Rib cage expands during exhalation.

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Important Questions on Respiration in Organisms

MEDIUM
Science>Biology>Respiration in Organisms>Human Respiratory System

Select the favourable conditions required for the formation of oxyhaemoglobin at the alveoli.

EASY
Science>Biology>Respiration in Organisms>Human Respiratory System
The maximum number of oxygen molecules that can bind to one molecule of hemoglobin is:
EASY
Science>Biology>Respiration in Organisms>Human Respiratory System
Which of the following factors are favourable for the formation of oxyhaemoglobin in the alveoli human lungs?
MEDIUM
Science>Biology>Respiration in Organisms>Human Respiratory System
Human fetal hemoglobin differs from the adult hemoglobin in that it has:
EASY
Science>Biology>Respiration in Organisms>Human Respiratory System

Select the correct events that occur during inspiration.

(a) Contraction of diaphragm
(b) Contraction of external intercostal muscles
(c) Pulmonary volume decreases
(d) Intrapulmonary pressure increases

EASY
Science>Biology>Respiration in Organisms>Human Respiratory System
During inhalation, the ribs:
EASY
Science>Biology>Respiration in Organisms>Human Respiratory System
The contraction of the diaphragm during inhalation
MEDIUM
Science>Biology>Respiration in Organisms>Human Respiratory System
The colour of blood is red due to the presence of:
MEDIUM
Science>Biology>Respiration in Organisms>Human Respiratory System

Read the following statements and identify the wrong ones among them:

(i) The oral cavity leads into a short larynx, which is a common opening for food and air.

(ii) A cartilaginous flap called “epiglottis” prevents the entry of food into the glottis.

(iii) The duct of the submaxillary gland is called the “Duct of Wirsung”.

(iv) Oesophagus leads into a J-shaped bag-like structure called “stomach”.

EASY
Science>Biology>Respiration in Organisms>Human Respiratory System
_____ is also called a wind pipe.
EASY
Science>Biology>Respiration in Organisms>Human Respiratory System
Stratified squamous epithelium is found in
MEDIUM
Science>Biology>Respiration in Organisms>Human Respiratory System
Which of the following is not associated with the process of respiration?
EASY
Science>Biology>Respiration in Organisms>Human Respiratory System
The sound produced through the mouth is called
EASY
Science>Biology>Respiration in Organisms>Human Respiratory System
During expiration, the diaphragm becomes
EASY
Science>Biology>Respiration in Organisms>Human Respiratory System
During exhalation the diaphragm moves ______.
MEDIUM
Science>Biology>Respiration in Organisms>Human Respiratory System
Select the incorrect statement w.r.t. the mechanism of breathing?
MEDIUM
Science>Biology>Respiration in Organisms>Human Respiratory System
During inhalation, the ribs are pushed 
MEDIUM
Science>Biology>Respiration in Organisms>Human Respiratory System
Read the following statements (A – D).

(A) The movement of air in and out of the lungs is carried out by creating a pressure gradient between the lungs and atmosphere.
(B) Inspiration can occur if the pressure within the lungs is more than the atmospheric pressure.
(C) Expiration takes place when the intrapulmonary pressure is lesser than the atmospheric pressure.
(D) The diaphragm and a specialized set of intercostal muscles in between the ribs help in the generation of such pressure gradients for breathing.

How many of the following statements are correct?
HARD
Science>Biology>Respiration in Organisms>Human Respiratory System
Which one of the following is a possibility for most of us in regard to breathing, by making a conscious effort?
EASY
Science>Biology>Respiration in Organisms>Human Respiratory System
During inspiration, the diaphragm