Ornithophilly takes place in:
1.  Yellow flower having nectaries
2.  Scented flower
3.  Flower with charming colour
4.  Modified corolla tube

Which pair is of insectivorous plants:
1.  Drosera and Vallisneria
2.  Utricularia and Hydrilla
3.  Allobandra and Utricularia
4.  Rafflesia and Dionea

Hair found in the inflorescences of Zea mays is the modification of:

Anemophilly type of pollination is found in:
1.  Salvia
2.  Bottlebrush
3.  Vallisneria
4.  Coconut