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

Explain working of refrigerator in microbiology laboratory, Explain the Wor...

Explain the Working of Refrigerator in Microbiological Laboratory? Refrigerator is a basic requirement in microbiological laboratory. It is used for maintaining microbial cultu

Peroxisome and lysosome, e use itwhat is difference between peroxisme and l...

e use itwhat is difference between peroxisme and lysosome what is function of it and where w

Genetics, The involuntary muscle movement is also genetical sk question #M...

The involuntary muscle movement is also genetical sk question #Minimum 100 words accepted#

Osmoregulation in non-chordate metazoans, Osmoregulation in Non-Chordate Me...

Osmoregulation in Non-Chordate Metazoans Previously you have studied that in protozoans, particularly fresh water protozoans; contractile vacuoles play a significant role in t

Explain the limiting factors for the growth of a population, What are the m...

What are the main limiting factors for the growth of a population? The factors that limit the growth of a population can be divided into biotic factors and abiotic factors. The

Explain about round worms, Which one of the following statements about cert...

Which one of the following statements about certain given animals is correct? 1. Round worms (Aschelminthes) are pseudocoelomates 2. Molluscs are acoelomates 3. Insects ar

In which condition ulcer continues, Complete the sentence by choosing one o...

Complete the sentence by choosing one of the given biological terms. If an ulcer continues and ultimately erodes all the way through the wall of stomach or duodenum, condition

Adrenocortical steroids - vertebrates, Normal 0 false false ...

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

Illustrate meiotic division, Q. In which meiotic division does the separati...

Q. In which meiotic division does the separation of the homologous take place and what are the ploidies of the generated cells after the end of that process? The separation of

What is resting membrane potential of a neuron, What is resting membrane po...

What is resting membrane potential of a neuron? What is the function of sodium potassium pumps in maintaining it?

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