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

How can the presence, Q. How can the presence, function of muscular tissue ...

Q. How can the presence, function of muscular tissue and localization in beings of the phylum Annelida is explained? In these beings there are a longitudinal muscular layer und

How are the circulatory systems of animals classified, Q. How are the circu...

Q. How are the circulatory systems of animals classified? A circulatory system is classified as open or closed. In open circulatory systems blood gets out of vessels and flows

Define the term ancestral characteristic, Define the term Ancestral charact...

Define the term Ancestral characteristic A character shared by all members of a taxonomic group of organisms (taxon) and used to define the unique nature of the group. The cha

Cyclins and cyclin-dependent kinases, Rhythmic fluctuations in the abundanc...

Rhythmic fluctuations in the abundance and activity of cell-cycle control molecules pace the events of the cell cycle. • Kinase - a protein which activates or deactivates another

Explain food habits - diet presciption, Food Habits Food Habits: These ...

Food Habits Food Habits: These must be known  so that the diets  can  be  recommended keeping in mind the  food preferences  of  the patient. Whether a person is  a vegetarian

Trophic level - ecosystem, Trophic Level - Ecosystem In an ecosystem, ...

Trophic Level - Ecosystem In an ecosystem, the various biotic components are related to each other and form food chains. If we group all the organisms in a food chain accordin

Measurement of nitrogenase activity, Measurement of Nitrogenase Activity ...

Measurement of Nitrogenase Activity There are various methods to find out whether an organism is a N 2 -fixer or not. If an organism can grow in normal atmosphere without any

Explain some medical considerations during breastfeeding, Explain some Medi...

Explain some Medical Considerations during Breastfeeding? Let us look into some special concerns during breastfeeding that might be useful to you as a dietitian. Medical Con

Define advantages of direct microscopic count, Define Advantages of Direct ...

Define Advantages of Direct Microscopic Count? 1. It is easy, inexpensive and relatively quick method. 2. It gives information regarding size and morphology of microorganism

Muncipal water treatment , The modern water treatment plan is often call...

The modern water treatment plan is often called upon to perform wonders with the water fed to it.  The clear, safe , even tasteful water that comes from a faucet may have started a

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