Assertion : During inspiration, the volume of thorax increases.
Reason : This happens due to the relaxation of diaphragm and inspiratory muscles.
Assertion : Forceful expiration occurs through expiratory muscles.
Reason : Expiratory muscles expires quickly.
Assertion : Vital capacity is higher in athletes than non-athletes.
Reason : Vital capacity is about 3.5-4.5 litres in a normal adult person.
Assertion : Gill-lamellae in aquatic animals help in exchange of gases
Reason : Each gill lamella carries many blood capillaries.
Assertion : In mammals, complex respiratory system has developed.
Reason : Mammalian skin is impermeable to gases.
Assertion : Insects develop a complex system of air tubes called trachea for respiratory purpose.
Reason : Exchange through body surface is not possible in insects.
Assertion : Abdominal muscles is related with respiration in animals.
Reason : Relaxation of abdominal muscles draws in air.
Assertion : Aerobic respiration involves the exchange of respiratory gases twice.
Reason : Exchange occurs from lung to heart and then heart to lung.
Assertion : Blood of insects is colourless
Reason : The blood of insect does not play any role in transport of oxygen.
Assertion : Severe Acute Respiratory Syndrome (SARS) originated in China.
Reason : China is the most populated country of the world
1. Both Assertion (A) and Reason (R) are the true and Reason (R) is a correct explanation of Assertion (A).
2.Both Assertion (A) and Reason (R) are the true but Reason (R) is not a correct explanation of Assertion (A).
3.Assertion (A) is true and Reason (R) is false.
4. Assertion (A) is false and Reason (R) is true