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

Temperature relations in animals, Normal 0 false false fals...

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

Define recommended intake of fibre, Define Recommended Intake of Fibre? ...

Define Recommended Intake of Fibre? 1. A minimum of fibre intake of 20 g/day is recommended by the American Dietetic Association (ADA), the National Cancer Institute, US and th

Adrenal medulla, ADRENA L MEDULLA The adrenal medulla develops from th...

ADRENA L MEDULLA The adrenal medulla develops from the neuroectoderm of the embryo. Medulla consists of chromaffin cells or phaeochromocytes. These cells are connected wi

Explain about the zone electrophoresis, Explain about the Zone Electrophore...

Explain about the Zone Electrophoresis? Zone electrophoresis which was introduced about a decade later describes the migration of charged macromolecules in a porous supporting

Explain the concepts of brain development, Explain the concepts of brain de...

Explain the concepts of brain development Two concepts that are especially critical to understanding brain development in the very young child are: Symbolic representati

What are the main manifestations of leishmaniasis, Q. What are the main man...

Q. What are the main manifestations of leishmaniasis? There are two key forms of leishmaniasis: visceral leishmaniasis and cutaneous leishmaniasis (also known as kala-azar). Th

Which are the structures that are part of the nervous system, Which are the...

Which are the structures that are part of the nervous system? The structures that form the nervous system can be separated into the central nervous system (CNS) and the periphe

Differance among subphylum chaetognatha and urochordata, Explain differance...

Explain differance between Subphylum Chaetognatha and Subphylum Urochordata? Subphylum Chaetognatha: Larval stages of this small group share some of the characteristics with

Explain the catabolic responses, Explain the Catabolic Responses? Hormo...

Explain the Catabolic Responses? Hormonal responses during the hyper inetabolic phase of infection are same as in case of injury. Serum cortisol levels are elevated, glycogen i

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