Explanation:
In cockroaches excretion takes place by Malpighian tubules while in prawns it takes place by green glands.
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$I.$ Kidneys are reddish brown and bean-shaped structure
$II.$ Kidneys are situated between the last thoracic and third lumber vertebra
$III.$ Each kidney of an adult human measures $10-12\, cm$ in length, $5-7\, cm$ in width, $2-3 \,cm$ thickness, and average weight $120-170$ $gram$
| Column $-I$ | Column $-II$ |
| $(a)\; P-$wave | $(i)$ Depolarisation of ventricles |
| $(b)\; QRS$ complex | $(ii)$ Repolarisation of ventricles |
| $(c)\; T-$wave | $(iii)$ Coronary ischemia |
| $(d)$ Reduction in the size of $T-$wave | $(iv)$ Depolarisation of atria |
| $(v)$ Repolarisation of atria |
Select the correct option
$(a)\quad (b)\quad (c) \quad (d)$