Assertion   :    Forceful expiration occurs through expiratory muscles.

Reason      :    Expiratory muscles expires quickly.

1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both the assertion and reason are false

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

How many of the following invertebrates exchange O₂ with CO₂ by simple diffusion
(Sponges, Coelenterates, flatworms, Annelida, Arthropoda, Mollusca, Pisces,)
1. 6
2. 5
3. 4
4. 3