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

What are flavonols and flavones, What are Flavonols and Flavones? These...

What are Flavonols and Flavones? These are the most widely distributed among the flavonoids. The most commonly occurring are Quercetin, Myricetin and Kaempferol. Quercetin is q

Management of diet for diabetes, Q. Management of Diet for diabetes? Di...

Q. Management of Diet for diabetes? Diet plays a very important role in management of diabetes as it exerts a direct influence on the blood glucose levels. It is one of the vit

Which areas of the globe is gymnosperm abundance noteworthy, Q. In which ar...

Q. In which areas of the globe is gymnosperm abundance noteworthy? These plants are the typical vegetation of cold regions like the boreal forest or taiga of the northern hemis

Explain the course of events during spontaneous blinking, Explain about the...

Explain about the course of events during spontaneous blinking. Course of Events during Spontaneous Blinking: Given ate the course of events which take place in the

Fibroblast, Fibroblast  is the term applied to a cell of connective tissue ...

Fibroblast  is the term applied to a cell of connective tissue which is separated from similar cells by some degree of the matrix material; fibroblasts secrete elastin and collagen

What are the micronutrients, What are the Micronutrients   All the micr...

What are the Micronutrients   All the micronutrients except molybdenum, boron and chlorine are available more in acid soils. These elements may limit plant growth either becaus

What are the hydrophobic molecules, Q. What are the hydrophobic molecules (...

Q. What are the hydrophobic molecules (or hydrophobic molecular regions)? What are the hydrophilic molecules? How can they be characterized in relation to their polarity? Hydro

What is reduction, What is reduction? The most commonly understood defi...

What is reduction? The most commonly understood definition of reduction is the removal of oxygen or addition of hydrogen ions. However, chemically, reduction can be defined as

Social determinants of health - social exclusion, Social Determinants of He...

Social Determinants of Health - Social Exclusion Given that absolute poverty is a major determinant of ill-health, the resultant social exclusion is ‘psychologically damaging,

Changes in the conformation - qualitative changes, Changes in the conformat...

Changes in the conformation of molecules - Qualitative Changes You may recall that linear chain of amino acids of a protein folds into a characteristic structure. Acidic resid

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