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

Class of subphylum uniramia - pauropoda, Class of Subphylum Uniramia - Paur...

Class of Subphylum Uniramia - Pauropoda A small group of uniramians, there are 500 species of Pauropoda explained so far. The minute organisms computing about 1.5 mm in length

Viriods and prions, Viriods and Prions Viroids        In 1971, T.O...

Viriods and Prions Viroids        In 1971, T.O.Diener reported that the  spinde tuber disease of potato causing gnarling and cracking of the tuber, is caused by multiplica

Complete test of hypothesis, Conduct a test of hypothesis to verify whether...

Conduct a test of hypothesis to verify whether a difference exists among the average numbers of ant species found at sites in the two regions of Mongolia. Use  .  You will require

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. Your patient has a respi

Define about the simple proteins, Define about the Simple proteins? Sim...

Define about the Simple proteins? Simple proteins are those which contain only amino acids or their derivatives and no prosthetic group. They yield only amino acids or their de

What process causes oxygen to pass from the alveoli, What process causes ox...

What process causes oxygen to pass from the alveoli into the lung capillaries? Diffusion is the process by which oxygen passes from the alveoli to the lung capillaries.

Which term describes a very heart/pulse rate, In studies of human body, whi...

In studies of human body, which of the below terms is used to describe a very rapid heart rate or pulse rate? Is it: a) Tachycardia b) Bradycardia c) Cardiosis d) Myoc

What are the tupes of aortic aneurysm surgery, What are the tupes of Aortic...

What are the tupes of Aortic Aneurysm Surgery? Types of Surgery :  Technique of surgery and the approach depends on the site of thoracic or thoraco abdominal aortic aneuiysm.

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