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

Is water a non-polar or a polar molecule, Q. Is water a non-polar or a pola...

Q. Is water a non-polar or a polar molecule? What is the consequence of that characteristic for the function of water as solvent? Ans. Water is made of two atoms of hydrog

Explain the term- pupil, Explain the term- PUPIL Pupil is  the  apertu...

Explain the term- PUPIL Pupil is  the  aperture in  centre of  the  iris diaphragm that regulates entry  of  light into the eye. Colour of  pupil  is  said  to be  black. Actu

Dna double helix , In the year of 1953, Watson and Crick worked out the...

In the year of 1953, Watson and Crick worked out the 3-D structure of DNA, beginning from X-ray diffraction photographs   taken through Wilkins and Franklin. They decreased which D

Common eye defects, COMMO N EYE DEFECTS - 1 .       Glaucoma - Pres...

COMMO N EYE DEFECTS - 1 .       Glaucoma - Pressure of aquous humour is increased, retina is degenerated. 2 .       Presbyopia - Due to non etastic cilliary muscles,

Describe the tailored to the individual patient, Describe the tailored to t...

Describe the tailored to the individual patient? Patent ductus arteriosus (PDA) interruption (surgical or transcatheter intervention): It is a curative procedure. Atrial

When a fatty acid reacts with thew glycerol, When a fatty acid reacts with ...

When a fatty acid reacts with glycerol, the result is- Select one: a. Formation of an amide b. Formation of an ester c. Formation of hydrocarbon d. Formation of a th

Explain adverse effects of ketoconazole, Explain Adverse Effects of ketocon...

Explain Adverse Effects of ketoconazole Anorexia, nausea and vomiting are common with higher doses (>400 mg/day) of ketoconazole; taking the drug with food or at bedtime may i

Determine the groups of soil organisms, Determine the groups of soil organi...

Determine the groups of soil organisms The soil organisms are classified into two broad groups viz. soil flora (related to plants) and soil fauna (related to animals) which ar

Explain the meaning of protein deficiency, Explain the Protein Deficiency? ...

Explain the Protein Deficiency? One of the most common nutritional disorders in the world today is the deficiency of protein. Both adults and children are affected, as the popu

Explain the function of cell walls, What is plant cell walls made of? ...

What is plant cell walls made of? Explain the function of cell walls? Plant cell walls are made of cellulose embedded in carbohydrates and proteins. Cell walls help su

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