Which of the following statements is correct?

  • A
    All animals require a medium for cellular respiration.
  • B
    In all animals,oxygen is transported by blood.
  • C
    All animals take $O_2$ from water or air through gills or lungs.
  • D
    All animals need $O_2$ for respiration.

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Do plants breathe?

Which of the following structures is lined by guard cells?

The amount of $CO_2$ in atmospheric air is: (in $\%$)

Define breathing.

$A$: Stomata are responsible for providing food to the plant while preventing water loss.
$R$: Stomata are specialized pores primarily designed for gaseous exchange.

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