MCQ
Embryo sac is called monosporic when it develops from:
- AOne of the megaspores out of the four megaspores which are derived from division of megaspore mother cell.
- BThree megaspores.
- COnly from two functional megaspores.
- DNone of these.
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Fill the correct option for $A$ and $B$
Reason : Injecting the microbes intentionally during immunisation or infectious organisms gaining access into body during natural infection induces active immunity.
$R$ - Agrobacterium tumifaciens is a pathogens ofseveral dicot plants