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

Obelia, why is it consideredto have an intermideate grade oforganisation

why is it consideredto have an intermideate grade oforganisation

Edema, Ed e m a It refers to excessive accumulation of fluid in tiss...

Ed e m a It refers to excessive accumulation of fluid in tissue spaces caused by disturbance in the fluid interchange between capillaries, tissue spaces and lymphatic vessel

Oxygen affecting the growth of microorganism, oxygen affecting the growth o...

oxygen affecting the growth of microorganism? The presence of oxygen in the atmosphere is required for the survival of human beings. Contrary to this, you would realize that th

Which are plant tissues that cover the stem and the leaves, Which are plant...

Which are plant tissues that cover the stem and the leaves? The stem perhaps covered by epidermis (having stomata, cuticle and photosynthetic cells) as in monocots or, alternat

Monohybrid cross, why does the monohybrid always result in a 1:2:1 ratio?

why does the monohybrid always result in a 1:2:1 ratio?

Pancreas and its structure, PANCREA S - It is derived from the endoder...

PANCREA S - It is derived from the endoderm of the embryo. Structure . The pancreas lies inferior to the stomach in a bend of the duodenum. It is both an exocrine an

Define the skeletal muscle, Define the Skeletal muscle A. Binding of ca...

Define the Skeletal muscle A. Binding of calcium ion to its receptor site on the actin molecule blocks the attachment of the head of the tropomyosin molecule to its binding sit

Phanerophytes - classes of life form, Phanerophytes - Classes of Life Form ...

Phanerophytes - Classes of Life Form The perennating buds in this case are present on erect, negatively geotropic shoots, much above the ground. These buds are naked or least

Explain the steps for injecting insulin injection, Explain the Steps for In...

Explain the Steps for Injecting Insulin Injection It is important to teach patient to take injections at regular times, 30 to 60 minutes before meals. Take insulin everyday, ev

Regulation of kidney function, Normal 0 false false false ...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

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