Ornithophily - cross-pollination, Biology

Ornithophily - Cross-pollination

In tropical areas, the birds dominate over insects as important pollinators. The most common among them are humming-birds, sun-birds and honey-eaters. Flowers pollinated by birds are generally orange, red, or yellow. Birds see well in this region of visible light. Birds do not have a strong sense of smell; consequently, bird-pollinated flowers usually lack much scent. Characteristic features of ornithophilous flowers are their tubular (Nicotiana glauca), cup shaped (Callistemon), or urn shaped (some members of Ericaceae) form, bright color, excess of pollen and nectar. As humming-birds (they occur only in The New World) are able to extract nectar while hovering over the flower, they do not need any heavy platform to land when they visit pendant flowers for pollination. In contrast, sun-birds (old world inhabitants) can perch in any position and suck out nectar even if they visit erect flowers.

Posted Date: 1/23/2013 2:42:29 AM | Location : United States







Related Discussions:- Ornithophily - cross-pollination, Assignment Help, Ask Question on Ornithophily - cross-pollination, Get Answer, Expert's Help, Ornithophily - cross-pollination Discussions

Write discussion on Ornithophily - cross-pollination
Your posts are moderated
Related Questions
Explain Heat Preservation - Method of Food Preservation? The process of heating was used centuries before its action was understood. Food is heated up or cooked. Heat kills mi

Toxoplasma gondii Another well known Sporozoan is Toxoplasma gondii which has an unusually wide host- range for n protozoan parasite. It can probably infect all warm-blooded a

Explain the drawback of protein hydrolysates The drawback of many protein hydrolysates, is that when hydrolysed, most of the food proteins liberate bitter  tasting peptides, wh

What is Biochemical Characteristics? In the last section we have learnt about the importance of biochemical tests. It must be clear now that biochemical tests are used to -

what is r and k selection

Q. Explain about Long acting insulin? Long acting: Long acting insulin does not work until 4 Lo 8 hours after injecting. Its peak activity occurs 18 to 24 hours after injectio

Nursing Care of Common Cold: Relieve Nasal Congestion Clean the nasal passage to remove secretions. In  infants nasal aspirator can be used while  the older children can

A weak acid (HA) has a pKa of 4.691. If a solution of this acid has a pH of 4.920, what percentage of the acid is not ionized? (Assume all H in solution came from the ionization of

Treatment and Nursing Management The initial treatment is surgical repair of  the cleft. The timing of the repair varies from surgeon to surgeon, but most prefer cleft lip rep

Modified or Semi-synthetic Gums These are natural polymers, which are chemically modified to give a new product with improved functional properties. These also fall into severa