AIIMS 2010
- Exam
- AIIMS
- Year
- 2010
- Subject
- Zoology
- Chapter
- Structural Organisation in Animals
AIIMS 2010 · Zoology · Structural Organisation in Animals
Assertion : In cockroach respiratory gases directly comes in...
Assertion : In cockroach respiratory gases directly comes in contact with the various organs of the body.
Reason : Cockroaches do not have respiratory pigment.
Options
- AIf both assertion and reason are true and reason is the correct explanation of assertion
- BIf both assertion and reason are true but reason is not the correct explanation of assertion
- CIf assertion is true but reason is false
- DIf both assertion and reason are false.
Correct answer
A. If both assertion and reason are true and reason is the correct explanation of assertion
Step-by-step solution
The blood of cockroach, also called as haemolymph is a mobile connective tissue composed of corpuscles and a colourless fluid, the plasma. It does not contain any respiratory pigment and therefore plays no role in respiration.
Respiratory organs of cockroach are spiracles, tracheae and tracheoles. The respiratory system consists of a network of trachea, that open through 10 pairs of small holes called spiracles present on the lateral side of the body. Thin branching tubes carry oxygen from the air to all the parts. The opening of the spiracles is regulated by the sphincters. Exchange of gases take place at the tracheoles by diffusion.