In crustaceans,respiration occurs through ..........

Respiratory exchange in seeds occurs through

Specialised respiratory organs are absent in:

Match List-$I$ with List-$II$ regarding the respiratory organs/mechanisms in different organisms:

List-$I$	List-$II$
$A$. Molluscs	$I$. Pulmonary respiration
$B$. Reptiles	$II$. Branchial respiration
$C$. Adult amphibians	$III$. Cellular respiration
$D$. Amoeba	$IV$. Pulmonary and Cutaneous respiration

Choose the correct answer from the options given below:

$O_{2}$ 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.

In insects,oxygen is transported to various tissues by ...........