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

How is the nervous tissue distributed in cnidarians, Q. How is the nervous ...

Q. How is the nervous tissue distributed in cnidarians? Their nervous system is diffuse there are no ganglia or brain. Q. What are the kinds of reproduction presented by cn

Improvement of cereal proteins - mutual supplementation, Define Improvement...

Define Improvement of cereal proteins - Mutual supplementation? Improvement of cereal proteins: Cereals, in general, are limiting in lysine and threonine while legumes, milk, m

What is the use of adrenergic receptor, Q. What is the use of Adrenergic Re...

Q. What is the use of Adrenergic Receptor? Adrenergic Receptors are also subdivided into 2 major categories: ALPHA α - or- BETA β In general, when NE (E) binds to alpha r

Explain spray-drying method, Spray-drying method Spray-drying is the co...

Spray-drying method Spray-drying is the common drying method in the production of ISP. The primary physical form of ISP in commerce, is that of fine powders. Structured form

State the aspects of functioning of neuropsychological test, State the vari...

State the various aspects of functioning of neuropsychological The MSE deals with questions concerning the addressee's Consciousness, Emotional State, Thought Content and Clar

How can bacteria produce human insulin, How can bacteria produce human insu...

How can bacteria produce human insulin on an industrial scale? What are the other forms of insulin made available by the pharmaceutical industry? Bacteria do not naturally synt

What is erythroblastosis fetalis, It is a hemolytic disease, which makes in...

It is a hemolytic disease, which makes in newborn. Maternal IgG antibodies cross the placenta and destroy the red bleed cells. This develops when an Rh+ expresses an Rh antigen on

Explain the histologic techniques, Explain the histologic techniques A...

Explain the histologic techniques A clinician has to base the diagnosis only on the clinical and radiographic findings as microbiologic and histologic techniques are restricte

What proportion of offspring will have same rflp pattern, A laboratory mous...

A laboratory mouse homozygous for an RFLP marker is mated to a wild mouse that is heterozygous for that marker. One of the heterozygous individuals resulting from this cross is mat

Thymus gland, THYMU S GLAND Flat, bilobed gland located in the medi...

THYMU S GLAND Flat, bilobed gland located in the mediastinal space in front of heart. Well developed in new born child and grows upto puberty but starts degenerating the

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