Which of the following pairs correctly represent an animal and its respiratory organ?
$(a)$ Silverfish $-$ Trachea
$(b)$ Scorpion $-$ Book lungs
$(c)$ Sea squirt $-$ Pharyngeal gills
$(d)$ Dolphin $-$ Skin

  • A
    $a$ and $b$
  • B
    $c$ and $d$
  • C
    $a$ and $d$
  • D
    $a, b$ and $c$

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In which of the following is the skin an accessory respiratory organ?

The respiratory organs vary in different animals due to their

Choose the correct option by matching the organisms in Column-$I$ with their respective respiratory organs in Column-$II$.
Column-$I$Column-$II$
$(p)$ Sponges$(I)$ Through tracheal tubes
$(q)$ Insects$(II)$ Through lungs
$(r)$ Molluscs$(III)$ Vascularized gills
$(s)$ Reptiles$(IV)$ Simple diffusion over their entire body surface
$(V)$ By their moist cuticle

Find the correct sequence for $p-q-r-s$.

Which of the following modes of respiration always continues in a frog?

Skin of man cannot act as a respiratory organ because

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