hi there Rustam,

ex-situ Conservation reffers to the conservation of the living organism outside their natural habitat these can be in the form of seeds,tissues,cells etc.

in the case of seed banks ex-situ is impemented for genetic diversity preservation. hence (a) is acorrect match.

lantana camara is a type of flowering plant but as it is very invasive in nature it is not categorised as exotic.

hence (B) is the incorrect match.