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

Reproduction, Reproduction Living things do not arise spontaneously. T...

Reproduction Living things do not arise spontaneously. They arise only from pre-existing living things This is one of the fundamental tenets of biology. The ability of an orga

The ideas of energy and chemical cycles, How do the ideas of energy and che...

How do the ideas of energy and chemical cycles, community structure, biodiversity and succession fit together to form the basis of the way the natural world works?

What is inharmonious ecological interaction, Q. What is inharmonious ecolog...

Q. What is inharmonious ecological interaction? The Inharmonious or negative ecological interaction is that in which at least one of the participating beings is harmed.

What is ciguatera fish poisoning, Question : (i) What is Ciguatera Fis...

Question : (i) What is Ciguatera Fish Poisoning provide some examples of fishes implicated in Ciguatera Fish Poisoning in Mauritius? (ii) Provide a general account of its d

Personnel - neonatal care unit, PERSONNEL It is important that while a...

PERSONNEL It is important that while allocating nursing, medical and paramedical staffs, the needs of the neonatal unit should not be ignored. The highest priority in the orga

Indications for surgery, Indications 1) Symptomatic patient with normal...

Indications 1) Symptomatic patient with normal LV function (ejection fraction 2 0.5 at rest). If they are in class In or IV NYHA, surgery is recommended. In this group of pat

Explain the frenal and muscle attachments, Frenal and Muscle Attachments: ...

Frenal and Muscle Attachments: Frenal attachment at the site of implant placement has to be evaluated. A high frenal attachment may have a definite pull on the gingival surroun

Can you explain plasmids, Q. What are plasmids? And what is the significanc...

Q. What are plasmids? And what is the significance of plasmids for the recombinant DNA technology? Plasmids are circular fragments of DNA that are accessories to the main bacte

Science class, Im learning about difference cell structures in science. I w...

Im learning about difference cell structures in science. I was wondering if I might be able to get some information about the epithelial tissue, and the connective tissue. Thankyou

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