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

Pressure and continuity, Pressure and Continuity Pressure Water...

Pressure and Continuity Pressure Water pressure increases with depth which varies in the ocean from 1 atmosphere where at the surface to 1000 atmosphere at the greatest

Determine the floor of nose and nasal spine, Floor of nose and Nasal spine ...

Floor of nose and Nasal spine Although variable, the nasal floor is typically situated 5-9mm below the level of inferior turbinates. The inferior piriform rim is used as a guid

Determine the failures at during abutment connection, During Abutment Conne...

During Abutment Connection Implants should be tested for the presence of any mobility and the radiographs should be taken. These radiographs are very vital as they serve as the

Enzyme-controlled reaction, If an enzyme-controlled reaction normally takes...

If an enzyme-controlled reaction normally takes place at 10ºC, in general terms how will the reaction be affected by  (a) a fall in temperature to 2°C , (b) a rise in temperature t

Protoplasmic theory, Protoplasmic Theory The living matter which forms ...

Protoplasmic Theory The living matter which forms the bodies of all living being is a special type of highly organized jelly like viscous semi fluid, and named Sarcode by Dujar

Explain the generalities, Explain the Generalities? A binary system has...

Explain the Generalities? A binary system has two components; C equals 2, and the number of degrees of freedom is F = 4 - P. There must be at least one phase, so the maximum po

Phylum ceolentrate, Compare and contracte the phylum of ceolantrat

Compare and contracte the phylum of ceolantrate

Explain the management of canal impediment, Management of Canal Impediment ...

Management of Canal Impediment a) Impediments are iatrogenic mishaps resulting from vigorous instrument short of the b) Appropriate working length and failure to confirm api

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