Which one of the following is one of the characteristics of self-pollinated flowers?

1. Flowers are large and showy
2. Flowers remain closed and do not open
3. Stigma and anthers mature at the same time
4. Pollen is produced in very large quantities

The kind of pollination in which the pollen of the same flower fall on its stigma is termed as:

1. Geitonogamy
2. Autogamy
3. Homogamy
4. Allogamy

Pollination by birds is termed as :

1. Entomophily
2. Anemophily
3. Ornithophily
4. Elephophily

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

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