The conditions necessary for vernalization are: (i) High temperature and water. (ii) Low temperature and water. (iii) Water and Carbon dioxide. (iv) Oxygen and water.

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Question:
The conditions necessary for vernalization are:
(i) High temperature and water.
(ii) Low temperature and water. 
(iii) Water and Carbon dioxide.
(iv) Oxygen and water.

1.(i), (ii) and (iii)

2.(i) and (ii)

3.(ii) and (iv)

4.(i) and (iii)

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