Nucellus - ovule, Biology

Assignment Help:

Nucellus - Ovule

Enclosed within the integuments lies a homogenous mass of tissue which is termed as the nucellus. This is the tissue in which the female gametophyte differentiates and develops. At an early stage of ovule development, usually an archesporial cell or a group of cells differentiate in the hypodermal region of the nucellus. The archesporial cell may function directly as the sporogenous cell. In such situations, the sporogenous cell also remains hypodermal in position and is surrounded by a single-layer of nucellus, in the micropylar region. Such ovules are known as tenuinucellate. These are commonly seen in Sympetalae.

405_Nucellus.png

Figure: Tenuinucellate ovule of Elytraria acaulis. In c and d integuments are not shown.


Related Discussions:- Nucellus - ovule

Diversty of living organisms, write down the division of cryptogamae and p...

write down the division of cryptogamae and phanerogamae

What organisms make glycogen, What organisms make starch? What is it used f...

What organisms make starch? What is it used for? What organisms make glycogen? What is it used for?

Explain balloon pulmonary valvuloplasty, Pulmonary stenosis is a relatively...

Pulmonary stenosis is a relatively common congenital heart defect. Usually these children with mild to moderate pulmonary stenosis survive into childhood. Since bicuspid pulmonary

Define arthropod by basic morphology - germ layers, Q. Arthropod identity c...

Q. Arthropod identity card. How are arthropods characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, digestive sys

Define regulation of intracellular ca concentration, Define Regulation of i...

Define Regulation of intracellular Ca concentration? The cytoplasmic calcium concentration is regulated by a series of calcium pumps, which either concentrate calcium ions with

Classification of viruses, Classification of Viruses No evolutionary or...

Classification of Viruses No evolutionary or phylogenetic exist between viruses. A   nature system of classification cannot, therefore, be devised for viruses. Holmes (1948)

Sedge-meadow stage - hydrarch, Sedge-Meadow Stage - Hydrarch Favoured ...

Sedge-Meadow Stage - Hydrarch Favoured by an increasing amount of light, as the former occupants disappear, they gradually change the reed swamp into a sedge meadow. And now s

Spoilage of pasteurized milk, Q. Explain Spoilage of pasteurized milk? ...

Q. Explain Spoilage of pasteurized milk? You would recall that pasteurization is one of the techniques to control and destroy the pathogenic, as well as, .spoilage bacteria i

A -helix protein structure, a - HELIX In this intra molecular h...

a - HELIX In this intra molecular hydrogen bonds are present The polypeptide chain is spirally coiled, generally in a clock-wise or right handed fashion. Glycine

How to measure a quality of water sample, various parameters which are used...

various parameters which are used in water quality measurement

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