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

Intro to Genetics and Punnett Squares , "Height" is an example of a gene, b...

"Height" is an example of a gene, but "Short" is an example of...

Sunlight - aquatic habitats, Sunlight - Aquatic Habitats Sunlight is a...

Sunlight - Aquatic Habitats Sunlight is a major limiting factor for water bodies, since light rapidly diminishes as it passes down the column of water. The upper layers of the

Determine balanced diet for celiac disease, Determine Balanced Diet For Cel...

Determine Balanced Diet For Celiac Disease? Energy: initially the children are seen to be malnourished, thus 100-120 Kcal/kg body weight/day with gradual increase to 150 Kcal

How are platelets formed, How are platelets formed? What is the function of...

How are platelets formed? What is the function of platelets? What consequences does the clinical condition known as thrombocytopenia yield? Platelets, also called as thrombocyt

Prevention of accidents - accidents and losses, Prevention of Accidents - A...

Prevention of Accidents - Accidents and Losses The theories of accident causation explained earlier serve as good guide to prevent accident. The factors that may cause acciden

Discuss the following term in brief - adaptive radiation, Discuss the follo...

Discuss the following term in brief - Adaptive  radiation Evolution of a variety of different species from a single common ancestor. Each is adapted for a particular niche, and

Importance value index (ivi) - synthetic characters, Importance Value Index...

Importance Value Index (IVI) - Synthetic Characters In any study of community, the quantitative value of each of the frequency density, and cover has its own importance. But t

PHYLUM MOLLUSCA, How we attempt a question of phylum mollusca?

How we attempt a question of phylum mollusca?

Advantages and disadvantages of mechanical valves, Advantages Durab...

Advantages Durability of these vales are long lasting.  Disadvantages Need for anticoagulant therapy is life long.  Risk of thrombo-embolism is hi

Which are the most important inorganic molecular substances, Q. Which are t...

Q. Which are the most important inorganic molecular substances for living beings? Ans. The most important inorganic substances for living beings are mineral salts, water,

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