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

Food chain, Food chain is the simplest representation of energy flow in th...

Food chain is the simplest representation of energy flow in the community. At the base is energy stored in the plants, which are eaten by the small organisms, which in turn are ea

Explain the frenal and muscle attachments, Frenal and Muscle Attachments: ...

Frenal and Muscle Attachments: Frenal attachment at the site of implant placement has to be evaluated. A high frenal attachment may have a definite pull on the gingival surroun

Define enrichment media - culture media, Define Enrichment Media - Culture ...

Define Enrichment Media - Culture Media? It contains selective ingredients in the medium, which shifts the growth in a mixed microbial population to a particular group of micro

Explain about hypothalamus, Explain about Hypothalamus Another importan...

Explain about Hypothalamus Another important part of brain is hypothalamus. It is very small in sie. It controls many important functions which are as follows:  Blood pre

Define significance of plants and animals on human life, Define Significanc...

Define Significance and Impact of Plants and Animals on Human Life? Plants and animals both have a great significance and unparalleled impact on human life. Most of our needs a

Determine the part of an actuating signal, Which of the following serves as...

Which of the following serves as an actuating signal, or as part of an actuating signal, in a negative feedback system? A. Action potentials in diaphragm skeletal muscle fibers

Diet of a msud patient, The diet of a MSUD patient (child) should therefore...

The diet of a MSUD patient (child) should therefore involve: • Measured quantities of natural protein or leucine from foods. • A BCAA free protein, vitamin and mineral supp

How does sexual reproduction occur in bacteria, How does sexual reproductio...

How does sexual reproduction occur in bacteria? How different are the modalities of bacterial sexual reproduction? Sexual reproduction happens when bacteria incorporate genetic

Define fat requirement for cancer patients, Define Fat requirement for canc...

Define Fat requirement for cancer patients? During cancer there is enhanced mobilization of free fatty acids from adipose tissues resulting in subsequent depletion of total bod

Which term describes organisms which live in lake/ocean, Which term is used...

Which term is used to describe organisms that live on or in the bottom of an ocean or lake. Such organisms can be found anywhere from the shoreline to greatest ocean depths? a)

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