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 the plant transpiration, What is the plant transpiration? What are ...

What is the plant transpiration? What are the two major types of plant transpiration process? Which of them is more important in volume? The Plant Transpiration is the loss of

Ant-nutritional factors limiting their optimum use, Ant-Nutritional Factors...

Ant-Nutritional Factors Limiting their Optimum Use The anti-nutritional factors (ANFs) are non-fibrous natural substances which occur as natural constituents of plants and anim

Explain results of abdominal aneurysm surgery, Explain Results of  abdomin...

Explain Results of  abdominal aneurysm surgery? Results:  For ascending aorta replacement, the hospital mortality varies from 0 to 9 per cent. Aortic arch has higher risk of

Protozoa, What is meant by encystment

What is meant by encystment

What result from unbridled continued of the population, Relative to carryin...

Relative to carrying capacity, what may result from unbridled continued growth of our population.

Lipids, LIPIDS Term given by Bloor. Lipids do not form polymers ...

LIPIDS Term given by Bloor. Lipids do not form polymers in nature except cutin (polymere of fatty acids). Most lipids are formed of fatty acids & alcohol. Ester bo

Show coding for stimulus intensity, Q. Show Coding for stimulus intensity? ...

Q. Show Coding for stimulus intensity? Coding for stimulus intensity: If AP's are all-or-none responses that do not vary in amplitude, how does the NS distinguish between stim

Define class cephalopoda in animal kingdom, Define Class Cephalopoda in ani...

Define Class Cephalopoda in animal kingdom? This group-including squids, octopuses, and the nautilus-is considered by most scientists to have the highest intelligence among all

Source of the bacteria of salmonellosis, Q. Source of the bacteria of Salmo...

Q. Source of the bacteria of Salmonellosis? The initial source of the bacteria is the intestinal tract of birds, reptiles, farm animals, humans and occasionally insects. As int

Explain phenotypical traits, Why is not Mendel's second law always valid fo...

Why is not Mendel's second law always valid for two or more phenotypical traits of an individual? Mendel's second law, or the law of the independent assortment, is valid for g

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