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

Upwelling zones of high biological productivity, Upwelling zones of high bi...

Upwelling zones of high biological productivity are found along the western coasts of the major continents. What causes this upwelling? a- cold currents moving from the equator tow

What is mass transportation across the cell membrane, Mass transportation i...

Mass transportation is the access or the exiting of substances in or from the cell engulfed by portions of membrane. The fusion of internal substance-having membranous vesicles wit

Oxidation of pyruvate to acetyl coa, OXIDATION OF PYRUVATE TO ACETYL CoA ...

OXIDATION OF PYRUVATE TO ACETYL CoA The oxidation of  pyruvate  to acetyl CoA is  the irreversible route from glycolysis  to the citric acid cycle. What is citric acid cycle?

What are the cell movements, Q. What are the cell movements and how are the...

Q. What are the cell movements and how are these movements created? Cell movements are movements executed by cell structures, like the movements of flagella and cilia, the pseu

What do you mean by oesophagitis, Q. What do you mean by Oesophagitis? ...

Q. What do you mean by Oesophagitis? We already know that oesophagus is a muscular tube 25 cm in length and basically helps in transporting the food from the mouth to stomach,

Can you explain coronary angioplasty, Q. Can you explain Coronary Angioplas...

Q. Can you explain Coronary Angioplasty? The concept of coronary angioplasty - enlargement of the lumen of a stenotic vessel by a catheter technique was first proposed by Dotte

Evolution of culture, A general agreerncnt anlong nll the human evolutionis...

A general agreerncnt anlong nll the human evolutionists who may have a very radical philosophical hackground and convictions is that man is the result of an extraordinary evolution

Explain adverse effects of fosamprenavir calcium, Explain adverse effects o...

Explain adverse effects of fosamprenavir calcium   Adverse effects are similar to those with amprenavir, but in clinical studies the incidence of nausea, vomiting and severe ra

Explain ganongs potometer, For measuring the rate of transpiration of a twi...

For measuring the rate of transpiration of a twig using Ganong's potometer, learner A cuts the twig and fits it in the broad end of the water-filled potometer. Learner B cuts the t

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