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

Give the results of distae dissection , Give the results of DistaE Dissecti...

Give the results of DistaE Dissection ? Results :  For acute dissection of different parts of aorta, the mortality is reported as 9 to 33 per cent. In the International Regis

Hygroscopic coeflicient-retention of soil moisture, Hygroscopic Coeflicient...

Hygroscopic Coeflicient To have a more complete picture of soil moisture relations, let us take a soil sample and oven dry it for 24 hours at 11 o C. Now if this soil is kept i

Polarity - root and shoot morphogenesis, Polarity - Root and Shoot Morphoge...

Polarity - Root and Shoot Morphogenesis Polarity is defined as having a difference (morphological, physiological or both) between the two ends of an axis or cells. This is lar

Role of carbohydrates in dyslipidemia, Q. Role of Carbohydrates in dyslipid...

Q. Role of Carbohydrates in dyslipidemia? It is important to know about these carbohydrates, as they all differ in their digestive properties. The rate of absorption is variabl

Define about the environmental deficiency of iodine, Define about the Envir...

Define about the Environmental deficiency of iodine? The ultimate causative Factor is deficient intake of iodine. Iodine occurs in soil and sea as iodide, the ions of which arc

Describe about results of total anomalous pulmonary venous, Describe about ...

Describe about Results of Total Anomalous pulmonary Venous Connection ? Reported hospital mortality varies from 2 to 20 per cent depending on the experience of cardiac surgery

Which period of life does the formation of gametes begin, Q. In which perio...

Q. In which period of life does the formation of gametes begin in women? The meiosis that forms female gametes begins in the cells of the ovarian follicles before birth after t

Determine indicators used in monitoring and surveillance, Determine Indicat...

Determine Indicators used in monitoring and surveillance? Various simple indicators may be used such as: 1) Weight-for-height 2) Body mass index (weight in kg/square of h

Orders, order of the phylum protozoa

order of the phylum protozoa

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