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

Determine the benedict test, Determine the Benedict's Test Glucose in u...

Determine the Benedict's Test Glucose in urine is detected by Benedict's method and the test is known as Benedict's test. This test is used to detect glucose in urine (Glycosur

Nuclear membrane - structure of nucleus, KARYOTHEC A OR NUCLEAR MEMBRANE ...

KARYOTHEC A OR NUCLEAR MEMBRANE It is also called Nucleolemma, term given by Erclab & Hertwig. Karyotheca composed of two unit membranes separated by a 150-300 A° wide p

Explain pyridoxal phoshphate, Pyridoxal phoshphate Pyridoxal  phosphate...

Pyridoxal phoshphate Pyridoxal  phosphate  is  derived  from  pyridoxine  (vitamin  B6)  and  is involved in amino acid metabolism.  The  other  two  compounds,  pyridoxal  and

Why do substances react with each other, Why do substances react with each ...

Why do substances react with each other? Chemical reactions occur due to the products of the reaction have less energy than the reactants (drive toward less energy). These reac

Define the utilization of most probable number techniques, Define the Utili...

Define the Utilization of Most Probable Number Techniques? The MPN technique (multiple tube technique) can be used to determine the presumptive coliform count in the food. The

Definition of osseointegration, Q. Definition of Osseointegration From the ...

Q. Definition of Osseointegration From the view of the patient? An implant fixture is osseointegrated if it provides a stable and apparently immobile support of a prosthesis un

Basic principles of planning diets for diabetes, Q. Basic principles of pla...

Q. Basic principles of planning diets for diabetes? The above objectives can be met by adhering to some of the basic principles of planning diets which include the consideratio

Creating a zoobook, Animal class....phylum arthropoda subphylum arthropoda

Animal class....phylum arthropoda subphylum arthropoda

What is soil horizons, What is Soil Horizons   In a profile, different...

What is Soil Horizons   In a profile, different horizons or layers are identified by certain designations assigned after comparison of the properties of the layer with those o

Drawbacks of nutritional status that assessed traditionally, Define drawbac...

Define drawbacks of Nutritional status that assessed traditionally? Nutritional status assessed traditionally with the use of anthropometric, biochemical clinical and dietary 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