$CO_2$ is primarily transported in the blood in the form of:

Identify the correct group of statements:
$I.$ Oxygen is carried by haemoglobin
$II.$ Oxygen is carried by carbonic anhydrase
$III.$ $CO_{2}$ is carried by haemoglobin
$IV.$ $SO_{2}$ is carried by haemoglobin
$V.$ Only oxygen is transported by the blood
$VI.$ Only $CO_{2}$ is transported by the blood
Choose the correct option.

The process by which chloride ions pass into $R.B.C.$ and bicarbonate ions pass out is called

What is hemoglobin?

Select the incorrect statement regarding hemoglobin.

How many molecules of $H_2CO_3$ are formed due to the presence of carbonic anhydrase in the cytoplasm every second?