Choose or find odd word - Ballot , Manifesto , Election , Vote

C. ELECTION

Choose or find odd pair of words - (Ammeter : Current) , (Hygrometer : Pressure) , (Odometer : Speed) , (Seismograph : Earthquakes)

B. HYGROMETER : PRESSURE

Choose or find odd word - Metre , Furlong , Yard , Mile , Acre

E. ACRE

Choose or find odd pair of words - (Ornithology : Birds) , (Mycology : Fungi) , (Biology : Botany) , (Phycology : Algae) , (Entomology : Insects)

C. BIOLOGY : BOTANY

Choose or find odd word - Albatross , Ostrich , Pelican , Penguin

B. OSTRICH