Assertion    :       Insects develop a complex system of air tubes called trachea for respiratory purpose.

Reason       :      Exchange through body surface is not possible in insects.

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 :       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             :       In mollusca, circulatory system is of closed type.

Reason               :       The blood of mollusca contains haemoglobin

Assertion  :       Histamine is involved in allergic and inflammatory reactions.

Reason     :       Histamine is a vasodilator

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

Which of the following is true about respiration
(1)it is for energy liberation

(2)it can occur both O2 presence and its absence

(3)In humans R.B.C show anaerobic respiration

(4)All of these

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

Frogs respire through
1. Skin
2. lungs
3. buccal cavity
4. All of these