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 kinds of mutation in disease-causing bacteria, What kinds of mutation ...

What kinds of mutation in disease-causing bacteria might make them more dangerous Pathogenic bacteria will become more dangerous to us if mutations make them more virulent or r

Animal cells, how to explain the structure and function of the organelle

how to explain the structure and function of the organelle

Morphogenetic movements, Morphogenetic Movements Gastrulation is a dy...

Morphogenetic Movements Gastrulation is a dynamic process including a variety of coordinated movements of cells of dissimilar areas of the blastula. The movements of cells in

How to recover from blood pressure, Q. How to Recover from Blood Pressure? ...

Q. How to Recover from Blood Pressure? The rate of the systolic blood pressure drop during recovery is usually fairly rapid after maximum exercise, although a rebound with a te

Illustrate chloroplast structure, Q. In which chloroplast structure are chl...

Q. In which chloroplast structure are chlorophyll molecules found? Chlorophyll molecules are placed in an organized manner in order to improve the exposure to light on the thyl

Internal and external respiration, External Respiration: Diffusion of...

External Respiration: Diffusion of oxygen into blood and carbon dioxide into alveoli (external respiration)  is the diffusion of oxygen from air in  the alveoli of lungs to bl

Name the endocytosis, Name the endocytosis?   A.  During endocytosis of...

Name the endocytosis?   A.  During endocytosis of GLUT4 transporters in fat cells, there is removal of GLUT4 transporters from plasma membranes.   B.  During endocytosis of

Phylum, Are protozoan''s diploblastic or triploblastic

Are protozoan''s diploblastic or triploblastic

Define the energy requirement to avoid underweight problem, Define the Ener...

Define the Energy requirement to avoid Underweight problem? The total calorie intake should be 500 to 1000 Kcal in excess of the daily needs in order to result a gain in weight

What structure of the eye produces tears, Q. What structure of the eye prod...

Q. What structure of the eye produces tears? Lachrymal gland, which is a part of larger lachrymal apparatus, produces tears that flow over anterior surface of the eye. Most of

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