Histogenesis and organogenesis, Biology

Assignment Help:

Histogenesis and Organogenesis

After the octant stage numerous cell divisions occur in various planes. The proembryo become globular or bulb-shaped. As a general rule, some tangential divisions occur in the cells of the octant so that three cells layers are differentiated - the outer dermatogen which later forms the epidermal covering, middle periblem which gives rise to the cortex of the stem and root, and inner plerome that is responsible for the vascular tissue and pith. Such a process of differentiation of cell layers is termed Histogenesis.

Organogenesis or differentiation of the initials of various organs begins in the globular proembryo in such a way that cotyledons (which form the first leaves), epiphysis (which gives rise to the stem ex) and hypophysis (that forms the root cortex and cap) are produced. Since organogenesis differs in dicots and monocots, we may discuss this aspect separately for the two groups of angiosperms with the help of suitable examples.


Related Discussions:- Histogenesis and organogenesis

Drugs for sexually transmitted infections, Drugs for Sexually Transmitted I...

Drugs for Sexually Transmitted Infections Many infections can be transmitted during sexual contact. The text and tables that follow are limited to management of sexually transm

How is light from the sun transformed into chemical energy, How is light fr...

How is light from the sun transformed into chemical energy to be used by the living beings on earth? Light from the sun is transmitted into chemical energy contained in organic

How to reduce the toxicity of a chemical in the body, Which process may not...

Which process may not reduce the toxicity of a chemical in the body?

Determine the term - neuropsychological screening, Determine the term - neu...

Determine the term - neuropsychological screening examination A neuropsychological screening examination is a considerably abbreviated version of a full neuropsychological ass

Use of echocardiography in pericardial diseases, Q. Use of echocardiography...

Q. Use of echocardiography in pericardial diseases? One of the earliest clinical applications of echocardiography was in the detection of pericardial effusion and it remains th

Theory of embryology - mosaic thoery, MOSAI C THOERY - It was given by...

MOSAI C THOERY - It was given by W. Roux. He studied the development of frog's egg. He destroyed one cells by a hot needle out of 2-cells formed as a result of first cleava

Birth control - temporary methods, BIRT H CONTROL - Birth control meth...

BIRT H CONTROL - Birth control methods which deliberately prevent fertilization are contraception. These methods may be temporary or permanent. 1 .       TEMPORARY MET

Pulmonary edema, Pulmonary edema occurs when movement of liquid from the bl...

Pulmonary edema occurs when movement of liquid from the blood to the interstitial space and/or into the alveoli exceeds the return of liquid to the blood and its drainage through t

Find if the sugar is a d- or l- stereoisomer, If carbon 1 is the carbonyl g...

If carbon 1 is the carbonyl group of a 6-carbon aldose (aldohexose), which carbon determines if the sugar is a D- or L- stereoisomer? Select one: a. 1 b. 2 c. 3 d. 4

Ulcerative enteritis (quail disease), Ulcerative enteritis (quail disease) ...

Ulcerative enteritis (quail disease) Ulcerative enteritis, caused by Clostridium colinum, is found in chicken, quails, pheasants, turkeys and some other birds. Clostridial or

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