Insects like cockroach and silverfish have which of the following respiratory pigments?

  • A
    Haemoglobin
  • B
    Haemocyanin
  • C
    Erythrocruorin
  • D
    None

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Respiratory exchange in seeds occurs through

The diaphragm is absent in which of the following?

Which of the following does not have a specific respiratory organ,yet performs the process of respiration?

$O_{2}$ exchange with $CO_{2}$ by simple diffusion over the entire body surface takes place in:
$I.$ Sponges
$II.$ Coelenterates
$III.$ Flatworms
Select the correct option to complete the given statement.

How does a tree trunk exchange gases with the environment although it lacks stomata?

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