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

How to culture mould plant, How to culture mould plant s Use either ster...

How to culture mould plant s Use either sterile dishes with potato slices or gelatin as those ready for the experiments on bacteria. Transfer mould from every of the sources in

Veins - circulation, Normal 0 false false false EN-IN ...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Complications of phototherapy, Complications of Phototherapy i) Inse...

Complications of Phototherapy i) Insensible water loss: There is increased insensible water loss in infants undergoing phototherapy. ii) Gastrointestinal effects: Photot

Which term describes organisms which live in lake/ocean, Which term is used...

Which term is used to describe organisms that live on or in the bottom of an ocean or lake. Such organisms can be found anywhere from the shoreline to greatest ocean depths? a)

Explain subphylum urochordata, Subphylum Urochordata : (13,000 species, se...

Subphylum Urochordata : (13,000 species, sea squirts) Notocord is dorally situated, nerve tube dorsally situated and is hollow, chordate characteristics seen mainly in bilatera

Temperate rain forests - ecosystem, Temperate rain forests - Ecosystem ...

Temperate rain forests - Ecosystem The temperate rain Forests are colder than any other rain forest and exhibit a marked seasonality with regard to temperature and rainfall. R

Regulation of fatty acid, The main point of control of β-oxidation is the a...

The main point of control of β-oxidation is the availability of fatty acids.  The major  source   of  free  fatty   acids   in  the  blood   is  from   the  breakdown   of triacylg

Do progeny shows all of the dominant phenotypes, Individuals of the followi...

Individuals of the following genotype are crossed: aa BB Cc Dd (crossed with) Aa Bb Cc Dd A) How many different phenotypes are possible for the progeny? B) What are the chanc

Fever, Fever influenza

Fever influenza

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