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

Which statement about asexual reproduction is false, Which statement below ...

Which statement below about asexual reproduction is FALSE? a.With asexual reproduction, offspring are genetically identical to the parent. b.Asexual reproduction requires no

What do you mean by descending aorta, Q. What do you mean by Descending Aor...

Q. What do you mean by Descending Aorta?  The descending aorta begins at the level of the fourth thoracic vertebra. It is defined through the cardiac shadow on the CXR, as it l

Define effect of protein deficiency during pregnancy period, Define effect ...

Define effect of Protein deficiency during pregnancy period? The effects of protein deficiency during pregnancy are difficult to separate from the effects of caloric deficit, s

Explain about the reduction tests - carbohydrates, Explain about the Reduct...

Explain about the Reduction Tests - Carbohydrates? These are a group of tests answered by reducing sugars. Since we have already discussed  reducing sugars, you will be able to

Explain gene expression - nutrient gene interactions, Explain Gene Expressi...

Explain Gene Expression - Nutrient Gene Interactions? The last two decades have witnessed tremendous development in our understanding of the cellular processes at the molecular

Anther, parts and functions of the anther

parts and functions of the anther

Vascular cambium, Vascular Cambium The vascular cambium usually, if no...

Vascular Cambium The vascular cambium usually, if not always, has a dual origin within the primary tissues; from provascular strands, and from the "ground" meristem tissues be

Carbohydrates, Carbohydrates These form about 1%part of protoplasm, the...

Carbohydrates These form about 1%part of protoplasm, they are comparatively simpler compounds of carbon, hydrogen and oxygen in the ratio 1:2:1 The ratio hydrogen to oxygen is

Anatomy and physiology , describe how ulcers can lead to distention and ir...

describe how ulcers can lead to distention and irritation followed by vomiting?

Which is structural isomers, Structural isomers: Select one: a. Have ...

Structural isomers: Select one: a. Have the same molecular weight b. Have the same connectivity c. Are mirror images d. All of the above e. None of the above

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