What are the functions of hemoglobin and chlorophyll?

Match the partial pressure of carbon dioxide in different parts involved in diffusion in comparison to the atmosphere.

Column-$I$	Column-$II$ ($mm\, Hg$ pressure)
$P$. Atmospheric air	$I$. $40$
$Q$. Tissues	$II$. $45$
$R$. Oxygenated blood	$III$. $0.3$

Which structure is not concerned with breathing in a frog?

In humans, respiration occurs in the following steps. Arrange these steps in the correct order.
$A$. Diffusion of $O_2$ and $CO_2$ between blood and tissues
$B$. Diffusion of $O_2$ and $CO_2$ across alveolar membrane
$C$. Pulmonary ventilation by which atmospheric air is drawn in and $CO_2$ rich alveolar air is released out
$D$. Cellular respiration
$E$. Transport of gases by the blood

In which of the following plants are sunken stomata found?

Describe the steps of respiration in short.