Enumerate the characters of ornithophilous flowers.

Explanation

`**` The ornithophilous flowers have the following characteristic features.
`**` The flowers are usually large in size.
`**` The flowers are tubular , cup shaped or urn - shaped.
`**` The flowers are brightly coloured , red , scarlet, pink , orange , blue and yellow which attracts the birds.
`**` The flowers are scentless and produce nectar in large quantities Pollen and nectar form the floral rewards for the birds vesting the flowers .
`**` The floral parts are tough and leathery to withstand the powerful impact of the vistors.