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

Why are broad-spectrum antibiotics used to treat infections, Why are broad-...

Why are broad-spectrum antibiotics often used to treat infections caused by unidentified pathogens? What is the danger associated with overusing such antibiotics? As broad-spec

What is metallic implants, What is Metallic implants Metallic implants ...

What is Metallic implants Metallic implants undergo one or more several surface modifications to enable them to become suitable for implantation. These modifications are passiv

Describe the examination of abdomen, Describe the Examination of Abdomen ? ...

Describe the Examination of Abdomen ? The contour of abdomen is to be recorded. Normally the abdomen is scaphold in sharp in a young adult. In case of fullness and bulge presen

Salts responsible for the cellular osmotic regulation, Q. What are the majo...

Q. What are the major mineral salts responsible for the cellular osmotic regulation? The main ions that act in the regulation of the osmotic pressure in tissues and cells are t

Newton, meaning of the law of inertia

meaning of the law of inertia

What is gluconeogenesis, What is gluconeogenesis There is accumulation ...

What is gluconeogenesis There is accumulation of lactate, which is released into the blood and taken up by  the liver where  it  is converted to glucose by  the  process called

Explain astrand cycle test, Explain Astrand Cycle Test? This is a sub m...

Explain Astrand Cycle Test? This is a sub maximal test done on cycle ergo meter. In this test, comparatively lower wattages are set. For example, for males less than 35 years o

What is plastids, What is Plastids? The most obvious difference between...

What is Plastids? The most obvious difference between plant cells and other eukaryotic cells is that cells of most plants contain unique organelles called plastids, which inclu

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