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

Tissue valves -surgical techniques, Tissue Valves :  Tissue valves mo...

Tissue Valves :  Tissue valves mounted on a frame with a sewing ring are inserted by the same technique as used in the case of prosthetic valves.

Animal nutrition, What are fluid and deposit feeding in holozoic animals

What are fluid and deposit feeding in holozoic animals

What is enzyme proteins, Enzyme  Proteins   that act  as  catalysts, speed...

Enzyme  Proteins   that act  as  catalysts, speeding the rate  at  which biochemical reactions proceed but not altering the direction or nature of the reactions.

Experiment the test for limestone, The test for limestone You can chec...

The test for limestone You can check the rock samples to see if any are limestone by dropping lemon juice, vinegar or some other dilute acid on them. If any are limestone they

What is a biodigester, What is a biodigester? A biodigester is equipmen...

What is a biodigester? A biodigester is equipment that creates carbon dioxide, hydrogen sulfide and fuel gases (biogases) like methane from organic material under decomposition

Significance of fertilization, SIGNIFICANCE OF FERTILIZATION - 1.      ...

SIGNIFICANCE OF FERTILIZATION - 1.      In fertilization process number of chromosome are diploid in zygote. 2.      During fertilization male & female chromosomes are combi

What is a biologic failure, What is A biologic Failure A biologic Fail...

What is A biologic Failure A biologic Failure can be defined as the inadequacy of the host to establish or to maintain osseointegration. The inability to establish osseoint

Define the patient care related to neurological disorder, Define the patien...

Define the patient care related to neurological disorder? A few additional points related to the patient care that need to be kept in mind include paying attention to the patie

Characteristics of population, CHARACTERISTIC S OF POPULATION - Each p...

CHARACTERISTIC S OF POPULATION - Each population envolves adaptations suited to its own locality. Population is unit of evolution. Population is also an ecological uni

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