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

Receptors - eye, EYE HISTOR Y - Steva n described it first. S...

EYE HISTOR Y - Steva n described it first. Study of eye is ophthalmology. Instrument used to examine interior of eye is  ophthalmoscop e . SHAP E - More o

What do you mean by trichomoniasis, Q. What is trichomoniasis? Why is it cl...

Q. What is trichomoniasis? Why is it classified as an STD? The Trichomoniasis is an extra-intestinal protozoan infection caused by the Trichomonas vaginalis, a flagellate proto

What is low - density lipoprotein subfractions, LDL is heterogeneous (Kraus...

LDL is heterogeneous (Krauss and Burke, 1982) and can be separated on density gradient ultracentifugation into subclasses that vary in size, density and lipid content. In healthy s

Explain future challenges of connecting models and data, Explain Future cha...

Explain Future challenges of connecting models and data? Since biological systems are complex, models of biological systems are also complex, and matching models and data is a

Explain fats, Explain Fats Fats: As you are already aware,  fats are ...

Explain Fats Fats: As you are already aware,  fats are reservoir  of  calories. In  addition  to carbohydrates,  fats can  also be  an important  source of  needed calories.

How time affecting taste quality, Q. How Time affecting taste quality? ...

Q. How Time affecting taste quality? Time- Time is another factor which affects sensation. Salt on tongue is sensed in a fraction of a second; whereas, bitter things may requir

How is sound vibration captured by the tympanum, Q. How is the sound vibrat...

Q. How is the sound vibration captured by the tympanum transmitted through the ossicular chain of the middle ear? The acoustic transmission from the middle to the external ear

Eastern/western/venezuelan equine encephalitis, Eastern/Western/Venezuelan ...

Eastern/Western/Venezuelan equine encephalitis This encephalitis causing group of viral diseases of wild birds including pheasants, chickens, turkeys, ducks and pigeons with a

Explain the importance of parent material, Explain the importance of parent...

Explain the importance of parent material Part of  these weathered minerals are transported  away by volcanoes, wind, water, ice, and waves etc. These very factors transport th

Determine the term - vascular disorders, Determine the term - Vascular diso...

Determine the term - Vascular disorders Normal central nervous system functioning can be affected by a number of vascular problems, because blood-vessel disease or damage can g

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