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

Simple squamous epithelium - stratified squamous epithelium, Q. How differe...

Q. How different is the simple squamous epithelium from the stratified squamous epithelium? Where can these epithelia are found in the human body? The simple squamous epitheliu

Coarse fish reach or lowland course zone, Coarse fish reach or lowland cour...

Coarse fish reach or lowland course zone This zone corresponds to the lower course of the river. Here the river is deep and slow moving. Its sluggish flow results in the depos

Pathophysiology and medical mangement of acute renal failure, Pathophysiolo...

Pathophysiology of Acute Renal Failure It is usually reversible but the deviation of physiologic function can be extreme and mortality in pediatric age group remains high. Th

Nature: matter and energy, Nature: Matter and Energy Nature is not just...

Nature: Matter and Energy Nature is not just our immediate surrounding or environment, but is the whole Universe of Cosmos. Study of the origin   and topography of cosmos is ca

Why is drosophila a convenient animal study of linked genes, Why is drosoph...

Why is drosophila a convenient animal for the study of linked genes? The fruit fly drosophila is appropriate for the study of Genetics because it presents many distinct traits

Photoperiodism was first characterised, Photoperiodism was first characteri...

Photoperiodism was first characterised in : 1. Tobacco 2. Potato 3. Tomato 4. Cotton Tobacco is the first in whic photoperiodism characterised.

How campylobacteriosis is caused, How Campylobacteriosis is caused It i...

How Campylobacteriosis is caused It is caused by  Campylobacter jejuni, a Gram-negative rod. It is a microaerophillic organism, which means it has a requirement for reduced lev

What are the advantages of yoga, What are the advantages of Yoga Yoga h...

What are the advantages of Yoga Yoga has been derived from the Sanskrit word Yuj which means union. It is popular since ancient times. It is also one of the means to maintain f

Which of these do not lay an amniotic egg, Which of the following does not ...

Which of the following does not (or did) not lay an amniotic egg? A) Birds B) Monotreme Mammals C) Dinosaurs D) Frogs E) Snakes

Trans myocardial laser re vascularisation, Trans Myocardial laser re vascul...

Trans Myocardial laser re vascularisation (TMLR) :  Patients who have severe angina and diffuse coronary artery disease with no graftable vessels are at limes subjected to TMLR. I

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