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

Show the inflammation triggered by bacterial infection, Q. Which type of de...

Q. Which type of defense cell do bacteria attract and cause to multiply during the inflammation process? What is the name given to the waste material produced by the inflammation t

Episode of diarrhoea, An episode of diarrhoea can be acute (recent origin) ...

An episode of diarrhoea can be acute (recent origin) or chronic (extended duration and repeated episodes) in nature. You may recall reading in the Food Microbiology ans Safety Cour

Improvement of cereal proteins - mutual supplementation, Define Improvement...

Define Improvement of cereal proteins - Mutual supplementation? Improvement of cereal proteins: Cereals, in general, are limiting in lysine and threonine while legumes, milk, m

Explain oligosaccharides, Oligosaccharides Compounds containing 2 to 6 ...

Oligosaccharides Compounds containing 2 to 6 monosaccharides units joined by a glycosidic  linkage.

Define factors that affect the requirement of protein, Define Factors that ...

Define Factors that affect the requirement of Protein? Protein requirement is greatly influenced by many factors such as age, environmental temperature, energy intake, gender,

Explain what an isotonic fluid loss means, Your client has the flu and repo...

Your client has the flu and reports 5-6 loose stools a day. He has experienced an isotonic fluid volume loss. Explain what an isotonic fluid loss means.

Define factors affect the rate and total drying time, Define factors affect...

Define factors affect the rate and total drying time? Four main factors affect the rate and total drying time, which include: a) The properties of the products (the moisture

Electron transport inhibitors, Electron Transport Inhibitors Several  c...

Electron Transport Inhibitors Several  compounds, including specific drugs, chemicals  and antibiotics  have been known to inhibit the electron  transfer  reactions at specific

How shigellosis diseases occur in humans, How shigellosis diseases occur in...

How shigellosis diseases occur in humans Occurrence: Poor personal hygiene is a  common factor in food borne shigellosis, with shellfish, fruits and vegetables, chicken and sal

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