Choose or find odd word - Arrow , Missile , Sword , Bullet , Spear

C. SWORD

Choose or find odd word - Cancel , Change , Repeal , Revoke , Rescind

B. CHANGE

Choose or find odd pair of words - (Fish : Pisciculture) , (Birds : Horticulture) , (Bees : Apiculture) , (Silkworm : Sericulture)

B. BIRDS : HORTICULTURE

Choose or find odd letter group - ECBFD , LQPOM , WSVTU , ROQNP , QSRTP

B. LQPOM

Choose or find odd letter group - ACHI , DFKL , MNST , OQVW , PRWX

C. MNST