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

Peculiarities of mitosis - cleavage, Peculiarities of Mitosis - Cleavage ...

Peculiarities of Mitosis - Cleavage From the following you will learn that the mitosis in the phase of cleavage has some striking peculiarities: a) Synchronization of cell

Major parts of the human ear, Q. What are the major parts of the human ear?...

Q. What are the major parts of the human ear? The human ear is divided into three major parts: the external ear, the internal ear and the middle ear.

Explain the nutritional and functional role of iron, Minerals :- Iron ...

Minerals :- Iron Food Source      Cereals, legumes, meat contamination from iron utensils and soil Nutritional Functional role Essential nutrient: Deficiency lead

Nerve cells, how to design a nerve cell for homework

how to design a nerve cell for homework

What are the maximum crop yields, What are the Maximum Crop Yields   Mi...

What are the Maximum Crop Yields   Mitscherlich conducted a large number of experiments with different plants, making use of pots 20 cm in diameter and 20 cm in depth. By addin

Who was charles darwin, Who was Charles Darwin? The Charles Darwin was ...

Who was Charles Darwin? The Charles Darwin was an English naturalist born in 1809 and considered the father of the theory of evolution. By the end of the year 1831, before turn

Name a few foods which are best blanched, Name a few foods which are best b...

Name a few foods which are best blanched? Yes, green beans, carrots, okra, turnip and cabbage should always be blanched. On the other hand, blanching is not needed for onions,

Aerobic based water treatment, Aerobic Based Water Treatment: Waste wat...

Aerobic Based Water Treatment: Waste water provides organic materials and inorganic nutrients to river waters; this is known as eutrophication. This promotes microbial and plan

Explain the liver biopsy assays, Explain the Liver Biopsy Assays? These...

Explain the Liver Biopsy Assays? These are used to measure the total vitamin A stores, as well us, the response in levels of vitamin A relative to different dosages of the vita

Ovarian androgens, Normal 0 false false false EN-IN X...

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

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