Which of the following is an example of an ornithophilous flower ?

1. Bougainvillea
2. Vallisneria
3. Bignonia
4. Rafflesia

Bright, showy and nectar producing flowers are needed for pollination to occur by:

1. Wind
2. Water
3. Insects
4. Elephant

Wing and keel petals are found in the flowers of:

1. Pea plants
2. Vallisneria
3. Maize plants
4. Dahlia

Which of these does not belong to the embryo sac of a flower?

1. Generative nucleus
2. Antipodal cells
3. Polar Nuclei
4. Synergids