Ornithophily - cross-pollination, Biology

Assignment Help:

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.


Related Discussions:- Ornithophily - cross-pollination

What is the usual shape of poriferans, Q. What is the usual shape of porife...

Q. What is the usual shape of poriferans? Sponges have bodies in the form of globes or tubular vases open in the upper extremity. They have a porous walls and internal central

Define the axon of a neuron, Consider an axon of a neuron. At time=t1, its ...

Consider an axon of a neuron. At time=t1, its voltage is at threshold for an action potential; at time=t2, its voltage is at 0 millivolts prior to the peak of that action potential

What si adenosine or dipyridamole thallium scan, Q. What si Adenosine or Di...

Q. What si Adenosine or Dipyridamole Thallium Scan? These studies are newer modalities that allow studying perfusion abnormalities to the myocardium when the patient cannot per

The effect of gravity on roots, The effect of gravity on roots Cut vari...

The effect of gravity on roots Cut various pieces of blotting paper about 8 cm square. Place these among two squares of glass. Place several radish or mustard seeds among the b

Mitral valve, This valve has the same basic features as  of the Tricuspid V...

This valve has the same basic features as  of the Tricuspid Valve. It has an anterior and a posterior cusp. The anterior cusp is larger and is attached on the upper right part of t

Bees, is there a difference between the giant asiatic bees apis dorsata and...

is there a difference between the giant asiatic bees apis dorsata and Philippine giant bees apis breviligula

Determine the categories of latent squint, Determine the categories of Late...

Determine the categories of Latent squint Latent squint category there are five subtypes: 1)  Esophoria 2)  Exophoria 3)  Hypophoria 4)  Hyperphoria 5)  Cyclopho

What do you mean by lofenalac, Q. What do you mean by Lofenalac? Lofena...

Q. What do you mean by Lofenalac? Lofenalac is a formula which is nutritionally complete except for phenylalanine. This formula is the main diet for the infants suffering from

Taxonomy, . Explain why the traditional classification of unicellular euka...

. Explain why the traditional classification of unicellular eukaryotes as ‘protozoa’ or ‘protists’ is invalid in terms of modern systematics and evolutionary theory. Why are trad

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd