MCQ
Match the following (column$-I$ with column$-II$)
- A$a(iii), b(iv), c(i), d(ii)$
- ✓$a(iv), b(iii), c(i), d(ii)$
- C$a(iii), b(i), c(iv), d(ii)$
- D$a(i), b(iii), c(ii), d(iv)$
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| Column - $I$ | Column - $II$ |
| $(a)$ Parasitism | $(i)$ $++$ |
| $(b)$ Commensalism | $(ii)$ $+-$ |
| $(c)$ Amensalism | $(iii)$ $0+$ |
| $(d)$ Mutualism | $(iv)$ $0-$ |
$1.$ primary treatment of sewage
$2.$ secondary treatment of sewage
$3.$ anaerobic sludge digester
$4.$ production of bioactive molecules