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

Post-operative nursing care of a child with cleft lip, Post-operative Care ...

Post-operative Care   The goals of care during post-operative period include:  Prevent the baby from sucking and crying to avoid tension on suture line.  Give proper p

How bone implant interface can be evaluated, How bone implant interface can...

How bone implant interface can be evaluated 1) Evaluation of the bone - implant interface can be done by following: i) Implant mobility and discomfort a)  Clinical implan

What is the impaired healing, Impaired Healing and Infection Because of Imp...

Impaired Healing and Infection Because of Improper Flap Design The oral field in itself is a contaminated area due to the presence of the normal oral microflora. Improper flap

Agro industrial-early embryonic mortality, Early embryonic mortality E...

Early embryonic mortality Embryo mortality is a serious problem for farmers, practitioners and researchers. The establishment and maintenance of pregnancy is a highly complica

Explain the secondary structure of proteins, Explain the Secondary structur...

Explain the Secondary structure of proteins The secondary structure of a protein involves the way that the chain of amino acid either twists or folds back upon itself to form a

Define quest of nutrition required for excercise, Define quest of nutrition...

Define quest of nutrition as sports nutrition as a discipline? Although the quest of nutrition as applied to exercise and sports dates back to ancient civilizations and importa

Human brain, what cause to hypertention?

what cause to hypertention?

How are the antibodies against the rh factor formed, How are the antibodies...

How are the antibodies against the Rh factor formed? Anti-Rh antibodies are made by humoral immune response. When an Rh- individual makes contact with the Rh factor this is rec

Cell theory, what year did virchow state where a cell exists there must hav...

what year did virchow state where a cell exists there must have been a pre-existing cell

Explain false left ventricular aneurysm, Explain False Left Ventricular Ane...

Explain False Left Ventricular Aneurysm? False Left Ventricular Aneurysm :  False aneurysm develops after acute rupture of an infarct. It is usually fatal, but a few survive

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