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

Are there living beings without cells, Q Are there living beings without ce...

Q Are there living beings without cells? Viruses are considered the only living beings that do not have cells. Viruses are constituted by genetic material RNA or DNA enwrapped

Flow cytometry, Flow cytometry is an analysis of biological material by de...

Flow cytometry is an analysis of biological material by detection of light- absorbing or fluorescing properties of cells or subcellular fractions (that is chromosomes) passing in

Elaborate angiography, Which term is used to describe the process whereby a...

Which term is used to describe the process whereby a catheter is inserted into an individual's heart, a radio-opaque medium is injected & x-ray images are made. Procedure is use

Explain the distant osteogenesis, Explain the Distant Osteogenesis In t...

Explain the Distant Osteogenesis In this an extracellular matrix establishes the implant surface contact. The osteogenic cells line the host bone surface. The blood supply to t

Protozoa, what are the disadvantages of protozoa

what are the disadvantages of protozoa

Salmonellosis, Salmonellosis The genus Salmonella comprises nearly 2500...

Salmonellosis The genus Salmonella comprises nearly 2500 serovars, traditionally based on Kauffman-White scheme in which H (flagelar) and O (somatic) antigens determine the ser

Alternative processing: alternative splicing, Various cases  are  now  know...

Various cases  are  now  known  where  variant  tissues  splice  the  main  RNA transcript of a single gene by instead pathways, where the exons which are lost and those which are

Explain emulsifying properties of proteins, Emulsifying properties of prote...

Emulsifying properties of proteins  Proteins are the surface-active substances, which are extensively used in the food industry as emulsifiers to manufacture products such as d

Ecology, Analyse the model that highlights the factors which influence the ...

Analyse the model that highlights the factors which influence the environmental impact of a population

What are the factors to an actual shift in the supply curve, What are the f...

What are the factors to an actual shift in the supply curve? Factors which cause an actual shift in the supply curve are described in below: When prices rise or fall this wo

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