Question

Name any one bird pollinated flower and mention one most important characteristic of such flowers.

Answer 1

Hint: Bird pollinating flowers are mostly brightly colored, odorless, and have mostly funnel-shaped corolla.

Complete answer:
A) The type of cross-pollination that takes place with the aid of birds is called Ornithophily.
B) The way plants adapt for ornithophily can be grouped firstly into those that attract and facilitate pollen transfer by birds.Many plants of the family Loranthaceae pollinate via ornithophily. Thus, an example of a bird pollinated flower is mistletoe.
C) One most important characteristic of sunflowers is that at the bud stage, sunflowers exhibit a unique trait called heliotropism. In heliotropism the bud of the sunflower faces the sun throughout the day, starting from the morning facing east and till the evening facing west.

Additional information:
The following are the adaptive measures taken by the plants to aid ornithophily:
 The flowers of these plants are typically colorful, with the red color dominating amongst other colors.
They have long tubular structures that hold abundant nectar.
 These flowers have brush-like, exerted stamens. The stamen and the stigma are oriented in such an order that ensures contact with the pollinator birds.
The ovules containing ovaries of these flowers have modifications that protect them from damage during vigorous foraging by the hard bills of the birds feeding on them.
These flowers are usually unscented.

(ornithophily) (mistletoe)

Note:
1) Diluted nectar is found in flowers with generalist bird pollinators, but those flowers bear concentrated nectar that has specialist pollinators such as hummingbirds or sunbirds.
2) The nectar of ornithophilous flowers differs in the composition of sugar, with hexoses having a high amount of passerine pollinated species while those that are insect-pollinated tend to be sucrose rich.
3) The family Nectariniidae of passerine birds is typically bird pollinators.
4) Birds involved in ornithophily are nectarivores. Thus they also adapt to feed with brushy tongues and long bills. Also, they are either capable of hovering flight or light enough to perch on the flower structures.