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 polio, Explain Polio Adults who have not previously been immuni...

Explain Polio Adults who have not previously been immunized against polio should receive a primary series of inactivated polio vaccine (IPV) if traveling to areas where polio i

What is karyotype, What is karyotype? Name the karyotype is given to th...

What is karyotype? Name the karyotype is given to the set of chromosomes of an individual, generally when visualized and identified under the microscope. The visualization in g

Food-borne zoonoses, Food-borne zoonoses Food-borne illnesses are seri...

Food-borne zoonoses Food-borne illnesses are serious public health problem. They are associated with the ingestion of contaminated foods by microorganisms and their toxins, ma

Main prophylactic measures against schistosomiasis, What are the main proph...

What are the main prophylactic measures against schistosomiasis? The main measures to stop schistosomiasis are: information for infected individuals to look for treatment and t

Animal nutrition, what steps can you take in order to assess why your cattl...

what steps can you take in order to assess why your cattle are not drinking enough water

Define term population, What is a population? In Biology a population i...

What is a population? In Biology a population is a set of individuals of the similar species living in a given place and in a given time.

Quantitative or analytical method for estimation of nitrogen, Define Quanti...

Define Quantitative or Analytical Method for Estimation of Nitrogen and Protein? You may recall reading earlier that proteins contain nitrogen along with carbon, hydrogen and s

Explain tricuspid regurgitation, Q. Explain Tricuspid regurgitation? Th...

Q. Explain Tricuspid regurgitation? Though tricuspid regurgitation is a common valvular abnormality on echocardiography rarely is it due to primary organic disease. Secondar

Formation of the amino acids sequences of a protein, Q. How do nucleotides ...

Q. How do nucleotides of mRNA chains encode information for the formation of the amino acids sequences of a protein? There are only four types of nitrogen- containing bases tha

Digestive system - large intestine, LARG E INTESTINE - More wider. Arr...

LARG E INTESTINE - More wider. Arranged around small intestine in the form of ? . It is 1.5 m long. Villi & microvilli absent. It shows 3 parts Ceacum, colon & rectum.

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