MCQ
Callus is
- AA part of phloem
- ✓An irregular growth developed as a result of injury
- CA part of companion cell
- DA part of parenchyma
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$R$- Embryo is formed from zygote.
Choose the correct option for $A, B, C, D$ and $E$

Column $A$ Column $B$
(i) Oncogenes (1)Causes $AIDS$
(ii) Single circular $DNA$ (2)Lac-Operon concept
(iii) Splicing (3) Component of bacterial chromosome
(iv) Jacob and Monad (4) Processing of $mRNA$ molecules
(5) When activated cause cancer
$(i) (ii) (iii) (iv)$ respectively