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

Osmoregulation in marine non-chordate metazoans, Osmoregulation in Marine N...

Osmoregulation in Marine Non-Chordate Metazoans Studies on the osmotic pressure of body fluids of marine organisms have displayed that their internal osmotic pressure is more

Main moral problem about the cloning of human individuals, What is the main...

What is the main moral problem about the cloning of human individuals? As well biological perils, a very serious moral problem involves the nucleus transplantation technology c

Explain indinavir, Indinavir (IDV, Crixivan) Indinavir has good oral ...

Indinavir (IDV, Crixivan) Indinavir has good oral bioavailability. Indinavir 800 mg combined with ritonavir 100 mg  (both b.i.d. for ease of use) was comparable in effectiven

Pathophysiology of myocarditis, Pathophysiology Infective endocarditis...

Pathophysiology Infective endocarditis occurs when turbulence within the heart allows causative organism to infect previously damaged valves or other endothelial surfaces.

What is thyroid disease, Q. What is thyroid disease? Thyroid disease: T...

Q. What is thyroid disease? Thyroid disease: Thyroid disease is associated with angina. Anginas pectoris presents itself in the form of speific symptoms which tend to re- oc

What are active and passive immunization, Q. What are active and passive im...

Q. What are active and passive immunization? According to the duration of the protection how do these types of immunization differ? Active immunization is that in which an anti

Zoonoses disease-anthrax, Anthrax Anthrax is primarily a disease of th...

Anthrax Anthrax is primarily a disease of the herbivores and occurs in almost all parts of the world. The disease has declined recently throughout the world as a result of the

Can you explain deoxynivalenol mycotoxicosis, Q. Can you explain Deoxynival...

Q. Can you explain Deoxynivalenol Mycotoxicosis? During 1987, an outbreak estimated to have affected over 50,000 people in the State of Jammu and Kashmir, was traced to the c

Associated foods with escherichia coli, Q. Associated Foods with escherichi...

Q. Associated Foods with escherichia coli? Associated Foods: E. coli is the etiologic agent of food poisoning involves variety of foods such as cream pie, mashed potatoes, cr

What is infra-diaphragmatic type of tapvc, What is Infra-diaphragmatic Type...

What is Infra-diaphragmatic Type of TAPVC? Initial stages of operation are the same as for supracardiac type of TAPVC. The heart is lifted out of the pericardial cavity and c

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