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

Evaluation of the programme or agency, Evaluation of the programme or agenc...

Evaluation of the programme or agency: It can be  based on following:  i)   Audit or review of programme or agency: This can be continuously done by the staff through in

What are the chloroplasts, Q What are the chloroplasts? What are the major ...

Q What are the chloroplasts? What are the major functions of chloroplasts? Chloroplasts are organelles present in the cytoplasm of algae and plant cells, like mitochondria, chl

Parazoans and simplest metazoans, in what aspect are the cnidarians simila...

in what aspect are the cnidarians similar to the protozoans?

Explain clostriduim botulinum, Q. Explain Clostriduim botulinum? Clostr...

Q. Explain Clostriduim botulinum? Clostriduim botulinum is widely distributed in soil and marine sediments throughout the. world. It is also found in the intestinal tract of a

Define intentional adulteration - types of adulteration, Define Intentional...

Define Intentional Adulteration - Types of Adulteration? In intentional adulteration, the substance is added, removed or substitute knowingly by the adulterator for the purpose

Reciprocal translocation and fusion, In chronic myelogenous leukemia, white...

In chronic myelogenous leukemia, white blood cells proliferate ceaselessly. In affected white blood cells, the BCR-ABL oncogene, the result of a gene fusion, transmits a constitu

Commensalism, #quesWhat benefits can commensalism offer to a species..

#quesWhat benefits can commensalism offer to a species..

Inhibition model - models of succession, Inhibition Model - Models of Succe...

Inhibition Model - Models of Succession According to this model, succession is very heterogenous because the development at any one site depends on who gets there first. Speci

Explain the phylum molluska - mollusks, Explain the Phylum Molluska - Mollu...

Explain the Phylum Molluska - Mollusks? You are probably very familiar with members of this phylum. The mollusks include the octopuses, squids, cuttlefish, scallops, oysters, c

State the term - neuropsychological examination, State the term - Neuropsyc...

State the term - Neuropsychological Examination For a neuropsychological examination a battery of tests administered should include, at a minimum: Intelligence Tests

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