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Question

In cockroaches, air enters the body through.


A

Lungs

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B

Gills

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C

Spiracles

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D

Skin

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Solution

The correct option is C

Spiracles


The correct option is C.

Explanations of the correct option:

Option C:

  1. In cockroaches air enters through spiracles.
  2. The respiratory system consists of the trachea which comprises 10 small holes known as spiracles.
  3. The spiracles are cartilaginous breathing organs that are openings for air to enter.
  4. They are paired and present on the thorax and abdomen.
  5. They are located on the lateral side of the body.
  6. There are thin branching tubules known as tracheal tubes (tracheal tubes are subdivided into tracheoles) which help to carry oxygen from the air to all the parts.
  7. The trachea functions to balance the air pressure inside the body.
  8. The entering oxygen is used to liberate energy when the oxygen-rich enters via diffusion through the trachea.
  9. Similarly, carbon dioxide moves out of the spiracles through the trachea as a respiratory waste output.

Explanations of the incorrect options:

Option A:

  1. Lungs are spongy air-filled sacs that are used to exchange the air in mammals, birds, reptiles, etc.
  2. Lungs are absent in cockroaches.
  3. In cockroaches the air does not enter through the Lungs.

Option B:

  1. Gills are the respiratory system used to diffuse air and oxygen in aquatic organisms.
  2. Gills perform the gaseous exchange of oxygen and carbon dioxide.
  3. This is an incorrect option as cockroaches do not contain gills.

Option D:

  1. Cutaneous respiration is the process of breathing through skin found in many amphibians.
  2. Cockroaches do not breathe through the skin.
  3. This is an incorrect option.

Final answer: In cockroaches, air enters the body through spiracles.


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