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

Kreb cycle, where does kreb cycle takes place

where does kreb cycle takes place

Fungal Reproduction, Hi, I have this presentation about the kingdom of fung...

Hi, I have this presentation about the kingdom of fungi, and no website could clearly explain the two processes of fragmentation and sporulation. I mean what are their steps? And w

What does balanced diet means, What does Balanced Diet means Balanced D...

What does Balanced Diet means Balanced Diet means diet which contains a variety of foods in such quantities and proportions that the need for energy, proteins, vitamins, minera

Health impacts of water pollution, Health Impacts of Water Pollution I...

Health Impacts of Water Pollution It is well known that clean water is absolutely essential for healthy living. Although adequate supply of fresh and clean drinking water is a

Define importance of nutrient and drug interaction, Define Importance of Nu...

Define Importance of Nutrient and Drug Interaction? Certain foods, beverages, alcohol, caffeine, and even cigarettes can interact with medicines. This may make them less effect

Properties of phytochrome, Properties of Phytochrome Phytochrome is a ...

Properties of Phytochrome Phytochrome is a chromoprotein: this means it is composed of a protein and a chromophore. The chromophore is actually attached to the protein and is

Eyelids, EYELID S - 3 in number. Dermis is thinnest in it. Upper an...

EYELID S - 3 in number. Dermis is thinnest in it. Upper and lower eye lid with eye lashes. Upper eye lid is more motile In reptiles lower eye lid is more motile. In cycl

Prevention and control of staphylococcal food poisoning, Q. Prevention and ...

Q. Prevention and Control of Staphylococcal food poisoning? Staphylococcal food poisoning can be prevented by: 1. Avoiding contamination of food with S. aureus. 2. Prev

Plants - rapidly flowing waters, Plants - Rapidly Flowing Waters Among...

Plants - Rapidly Flowing Waters Among the plants only small, well attached forms, such as sessile algae can survive here. Thus, due to the presence of only a few plants, the n

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