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

Maggots and murder, Plot the data as a suitable graph. Join the points with...

Plot the data as a suitable graph. Join the points with the best-fitting smooth curve.Temperature oC(5,10,11,13,17,19) Time taken for eggs to hatch/h 230 90 70 30 25

What is haccp control, HACCP Control :  a) To manage the conditions of an o...

HACCP Control :  a) To manage the conditions of an operation  to maintain compliance with established criteria. b)  The state where correct procedures are being followed  and  c

Define water - important nutrient, Define Water - Important Nutrient? M...

Define Water - Important Nutrient? Macronutrients, you know, are those nutrients which are required in large amounts by our body namely, carbohydrates, fats and proteins. We st

Clonning, write a note on clonning

write a note on clonning

Genetics, discuss chromosomal theory of heredity.

discuss chromosomal theory of heredity.

Explain the importance of surgery, Explain the Importance of Surgery? W...

Explain the Importance of Surgery? Well, surgery is that branch of medical science which has for its object the cure of local injuries or diseases, as wounds or fractures, trau

What is the usual shape of poriferans, Q. What is the usual shape of porife...

Q. What is the usual shape of poriferans? Sponges have bodies in the form of globes or tubular vases open in the upper extremity. They have a porous walls and internal central

What is condition for the mendel''s second law to be valid, What is conditi...

What is condition for the Mendel's second law to be valid? The Mendel's second law is only valid for genes located in various chromosomes. For genes situated in the similar chr

Protozoa., show me the schamatic diagram of chrysomoeba?

show me the schamatic diagram of chrysomoeba?

Explain stavudine, Explain Stavudine It can be given either in initial ...

Explain Stavudine It can be given either in initial combination therapy or after failure of regimens containing other NRTIs. Cross-resistance with zidovudine is frequent, ho

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