Ovule, Biology

Assignment Help:

Ovule

The ovule, also known as the megasporangium is the forerunner of the seed. It consists of a central mound of tissue called the nucellus, which is enveloped by one or two coverings - the integuments. An ovule ready for fertilization consists of nucellar tissue enveloped almost completely by integument(s), leaving a small pore or opening at the apical end.

This opening, called micropyle is the main passage for the entry of the pollen tube into the ovule. This end of the ovule is generally referred to as the micropylar pole and the opposite pole where funiculus is attached is called the chalazal pole. The ovule is attached to the placenta through a stalk-like structure the funiculus. In the nucellus is present the female gametophyte which is commonly referred to as the embryo sac.

 


Related Discussions:- Ovule

Explain fundamental of the photosynthesis process, Q. Is it correct to cons...

Q. Is it correct to consider water decomposition by the action of light the fundamental of the photosynthesis process? In addition ADP photophosphorylation, photic energy is al

Radioactive labelling, Radioactive Labelling Radioactive labelling me...

Radioactive Labelling Radioactive labelling method has been effectively applied on the chick blastoderm. The method includes labelling one embryo (donor) and grafting a part

Which are the organs of the excretory system, Which are the organs of the e...

Which are the organs of the excretory system? The excretory system is produced of kidneys (two), ureters (two), bladder and urethra. The Excretory System - Image Diversity:

What are the main manifestations of leishmaniasis, What are the main manife...

What are the main manifestations of leishmaniasis? There are two major forms of leishmaniasis: cutaneous leishmaniasis and visceral leishmaniasis (also called as kala-azar). Th

Blood flow during exercise - circulation, Normal 0 false fals...

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

Haptotaxis - modes of cell movement, Haptotaxis - Modes of Cell Movement ...

Haptotaxis - Modes of Cell Movement Haptotaxis considers to the directed movement of cells in response to a concentration gradient of an adhesive molecule that might be presen

Advantages of fertilizers and manures, Advantages of Fertilizers and manure...

Advantages of Fertilizers and manures Fertilizers and manures are necessary for maintaining the soil in a high state of fertility and productivity.  It is important to know the

How do the golgi apparatus act, Q. How do the Golgi apparatus act and the r...

Q. How do the Golgi apparatus act and the rough endoplasmic reticulum in the production and releasing of proteins? The rough endoplasmic reticulum has in its outer membrane man

Root - plant growth substances, Root - Plant Growth Substances Inducti...

Root - Plant Growth Substances Induction of roots by auxins in stem cuttings is a well known phenomenon. The concentrations needed are much lower as compared to that which pro

Consumptive use values, This means the non-market value of natural products...

This means the non-market value of natural products such as firewood, game and fodder that do not pass through a market or product preparation. Indigenous people in developing cou

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