| Column-$I$ | Column-$II$ |
| $(A)$ Blue-green algae | $(i)$ Spirogyra |
| $(B)$ Unicellular algae | $(ii)$ Nostoc |
| $(C)$ Filamentous algae | $(iii)$ Volvox |
| $(D)$ Colonial algae | $(iv)$ Chlamydomonas |
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A conducting square loop is placed in a magnetic field $B$ with its plane perpendicular to the field. The sides of the loop start shrinking at a constant rate $\alpha$. The induced emf in the loop at an instant when its side is ' $a$ ' is
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