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

Epithelial cells of the kidney proximal tubule, Which of the following is t...

Which of the following is true for the epithelial cells of the kidney proximal tubule? A. The sodium-glucose co-transporter in the luminal membrane is responsible for the net f

Describe the benefits of neuropsychological test, Describe the benefits of ...

Describe the benefits of Neuropsychological test The tests can be helpful in the assessment of: Change in mental status Abnormalities in function before abnormalitie

Mcnaughton case and law, MCNAUGHTON'S CASE AND LAW: In 1843, McNaughto...

MCNAUGHTON'S CASE AND LAW: In 1843, McNaughton shot and  killed Sir Robert Peel's secretary Edward -Drymmond.  It was  shown  that McNaughton suffered from a number of  delusi

Explain therapeutic diets, Explain Therapeutic diets Therapeutic diets ...

Explain Therapeutic diets Therapeutic diets are adaptations of the normal or  regular diet.  In other words, it is a diet  for a patient suffering  from a  specific disease  su

Seed formation, Seed Formation A mature seed has seed coat, an embryo ...

Seed Formation A mature seed has seed coat, an embryo and reserve food material in the endosperm in monocots and in cotyledons in the dicots. Figure shows structure of dicots

Excretory system - uriniferous tubule, URINIFEROU S TUBULE - Unit of...

URINIFEROU S TUBULE - Unit of kidney. 3-5 cm. long (30 mm). Total length of nephrons is 65 km. A tubule consists of - 1 .       Malpighian capsule           (

Describe class echinoidea in animal kingdom, Describe Class Echinoidea in a...

Describe Class Echinoidea in animal kingdom? Sand dollars and sea urchins either have flattened disc-like bodies, or are somewhat spherical. While they lack the typical five-ar

Assessment of magnesium status and dietary requirements, Define Assessment ...

Define Assessment of Magnesium Status and Dietary Requirements?  In order to estimate Mg requirements and establish relationship between magnesium intake and deficiency, it is

Describe pathophysiology of tetralogy of fallots, Describe Pathophysiology ...

Describe Pathophysiology of tetralogy of fallots ? The PS causes concentric hypertrophy of right ventricle without enlargement. The right ventricular pressure are equal to or h

How are water and mineral salts tranport in the plant, How are water, miner...

How are water, mineral salts and food (sugar) transported throughout the plant? Water, mineral salts and sugar are transported throughout the plant through conductive vessels f

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