Respiratory System of Cockroach

Q. How many spiracles are there in cockroaches?

1. 40 spiracles
2. 10 spiracles
3. 20 spiracles
4. 60 spiracles

Q. Choose the incorrect statement:

1. Earthworms - Produce haemoglobin; lack specialised breathing devices; muscular gizzard for grinding of decaying leaves
2. Cockraoch - nocturnal and omnivorous; respiratory pigment absent
3. Frog - performs cutaneous respiration in water and pulmonary respiration on land
4. Nephridia in cockroaches, malpighian tubules in earthworms and urinary tubules in rats all have similar function

Q.

Consider the following four statements regarding the nervous system of a cockroach and choose the correct option indicating as true (T) or false (F) respectively.

1. The Brain of a cockroach is primitive and is made of 2 supra-oesophageal and 1 sub-oesophageal ganglia, connected by 2 circum-oesophageal connectives.

2. It has 3 thoracic and 6 abdominal, segmental ganglia.

3. All the Sensory organs are under the control of the brain directly.

4. Receptors are of tactile, chemo and photo sensory in nature

1. 1. F 2. T 3. F 4. T

2. 1. F 2. F. 3. T 4. T

3. 1. T 2. T. 3. F 4. T

4. 1. T 2. F. 3. T 4. F

Q. Assertion: In cockroaches, respiratory gases directly comes in contact with various organs of the body.
Reason: Cockroaches do not have respiratory pigment.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A and R are false.