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

How would you perform abo blood grouping, Question 1 How would you perform...

Question 1 How would you perform ABO blood grouping? Add a note on advantages and disadvantages of each method. Also discuss the precautions you may take to avoid errors in variou

Transcription factors have multiple domains, In most cases, the transcripti...

In most cases, the transcription factors in eukaryotes which bind to promoter   or enhancer sequences   are activator   proteins   which induce   transcription.   That proteins gen

Show the embryological evidence, Q. Show the Embryological Evidence? Em...

Q. Show the Embryological Evidence? Embryology is the study of the successive stages of sporogencsis , gametogenesis and the growth and development of the embryo. The number o

Can you illustrate trna anticodon, Q. If a tRNA anticodon is CAA what is it...

Q. If a tRNA anticodon is CAA what is its corresponding mRNA codon? For the genetic code which amino acid does this codon codify? According to the C-G, A-U rule, the correspond

Pedology, Pedology: This is the study of soil. Pedology is a type of study...

Pedology: This is the study of soil. Pedology is a type of study of soils in their natural environment. Pedology is one of two main branches of soil science and the other big is e

Characteristic features of phylum cnidaria, Characteristic features of Phyl...

Characteristic features of Phylum Cnidaria All are aquatic animals. Radial or biradial symmetry around an oro-aboral axis, but no head. Diploblastic, with an epidermi

Gametophytic incompatibility, Gametophytic Incompatibility In GSI syst...

Gametophytic Incompatibility In GSI systems callose deposition is not evident on the stigma but is very conspicuous in the pollen tube. Sometimes the callose deposition occurs

Explain problems of infants and preschoolers nutrition, Explain Problems of...

Explain Problems of Infants and Preschoolers Nutrition? In spite of all nutrition interventions, there are some of the common yet life threatening problems which need to be loo

Pituitary disorders, PITUITARY DISORDERS - (a) Pituitary Dwarfism . It...

PITUITARY DISORDERS - (a) Pituitary Dwarfism . It is caused by the deficiency of growth hormones (GH) from childhood. It is characterised by small but well porportioned body a

Excretion in roundworm, EXCRETIO N IN ROUNDWORM - In ascaris 4 coelomo...

EXCRETIO N IN ROUNDWORM - In ascaris 4 coelomoducts present, attached to each other by canaliculli in front of controling cell i.e. Rennete cell. Excretion materials are gi

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