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

What is symbiosis, Question Write a short note on the following: 1...

Question Write a short note on the following: 1 Gram staining 2 Embden-Meyerhoff-Parnas pathway 3 Interferons 4 Probiotics 5 Pasteurization 6 Endospores

How do bones grow, Q. How do bones grow? Bones form and develop through...

Q. How do bones grow? Bones form and develop through a process known as ossification. There are two types of ossification: endochondral ossification and intramembranous ossific

Express the three functional classifications of joints, In general compare ...

In general compare and contrast the three functional classifications of joints according to movement.

How are the major classes of arthropods classified, Q. How are the major cl...

Q. How are the major classes of arthropods classified according to the presence of larval stage in their embryonic development? In crustaceans there are others with indirect an

Explain about the proteins, Explain about the Proteins? Proteins, as yo...

Explain about the Proteins? Proteins, as you may already know, are made up of carbon, hydrogen, nitrogen, oxygen and usually sulphur. Proteins are built up of a large number of

Target tissues and organs of each adenohypophyseal hormone, Q. What are the...

Q. What are the target tissues and target organs of each adenohypophyseal hormone? GH- bones, muscles and cartilages, Prolactin- mammary glands, ACTH- the cortical portion of t

Reproduction, The fusion of two individuals with each acting as a gamete is...

The fusion of two individuals with each acting as a gamete is known as

Why is colour an important characteristic of food, Q. Why is colour an impo...

Q. Why is colour an important characteristic of food? Colour is an important quality attribute in food although they do not necessarily influence their nutritional, flavour or

Advanced nervous systems - general trend in evolution, Advanced Nervous Sys...

Advanced Nervous Systems - General Trend In Evolution In higher groups of animals you will observe clear trends towards centralisation of the nervous system, to maximize effe

What are the four groups of protozoans, Q. What are the four groups of prot...

Q. What are the four groups of protozoans? The four main groups of protozoans are the mastigophores flagellated, like the trypanosome that causes Chagas' disease, the sarcodine

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