Obturator - ovule, Biology

Assignment Help:

Obturator - Ovule

An obturator is an outgrowth of the placenta or funicle or integument or style near the micropyle. It is presumed to guide the pollen tube to the micropyle. This tissue is either composed of thin-walled compact tissue or it is made up of loose hairy outgrowths. The cells of the obturator at the ultra structural level, show dense cytoplasm containing a copious number of ER, dictyosomes, and vesicles. The cells of the obturator produce a surface exudate and provide mechanical and chemical guidance to the growing pollen tube.

323_Obturator.png

Figure:  Obturator in Tetragonia tetragonioides


Related Discussions:- Obturator - ovule

What are the hormones produced by the testicles, What are the hormones prod...

What are the hormones produced by the testicles and the ovaries? The testicles make androgenic hormones, the major of them being testosterone. The ovaries make estrogen and pro

Define food behaviour - public nutrition, Define Food Behaviour - Public Nu...

Define Food Behaviour - Public Nutrition? Food is not merely a means to survival but the fuel that drives the human body and the economic engine. What influences what we decide

Explain the double and simple closed circulation, What is the difference am...

What is the difference among double closed circulation and simple closed circulation? Double closed circulation, or closed circulation, is that in which the blood circulates by

Human population-historical overview, Human Population-Historical Overview ...

Human Population-Historical Overview Throughout history, the human population has been quite small. It has grown relatively slowly and even experienced occasional declines. Fi

What is central shunt in palliative operations, What is Central Shunt in Pa...

What is Central Shunt in Palliative Operations? When the pulmonary artery branches are small, an interposition graft could be used as a shunt between main pulmonary artery and

Heroin (diacetylmorphine or diamorphine), HEROI N (DIACETYLMORPHINE OR DIA...

HEROI N (DIACETYLMORPHINE OR DIAMORPHINE) - Heroin is a white, crystalline semi synthetic compound prepared from morphine by acetylation. Most dangerous opiate. It i

What are the chemical requirements of implant materials, What are the Chemi...

What are the Chemical requirements of implant materials It must withstand corrosion by body fluids It should not have any direct or indirect negative effects on the surround

Demonstration of tremendous diversity, Q. Demonstration of tremendous diver...

Q. Demonstration of tremendous diversity? A objective of taxonomy is the assemblage of knowledge gained. This is usually in the form of treatises useful to fellow scientists an

How is l. monoctogenes infection transmitted, How is L. monoctogenes infect...

How is L. monoctogenes infection transmitted? Listriosis caused by Listeria monocytogenes infection. Transmitted by animal excretions (faecal matter) and secretions, infecte

Proteins requirement in dyslipidemia, Q. Proteins requirement in dyslipidem...

Q. Proteins requirement in dyslipidemia? Proteins: While the quantity of protein does not impose any significant impact on the serum lipoproteins, it is the quality of protein,

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