Histogenesis and organogenesis, Biology

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.

Posted Date: 1/23/2013 7:24:20 AM | Location : United States







Related Discussions:- Histogenesis and organogenesis, Assignment Help, Ask Question on Histogenesis and organogenesis, Get Answer, Expert's Help, Histogenesis and organogenesis Discussions

Write discussion on Histogenesis and organogenesis
Your posts are moderated
Related Questions
Snakes Non-poisonous snakes can be brought into the classroom for observation. The diagram shows how a safe cage can be made for keeping a snake. The bottom should be covered w

Can stroke be prevented Brain experts are convinced that several strokes can be prevented with proper attention to lifestyle factors which increase risk, including smoking, exc

Transmissible spongif orm encephalopathies Transmissible spongiform encephalopathies (TSEs, also called Prion diseases) are fatal neurodegenerative diseases such as scrapie of

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

They result from septic embolization of vegetations to the arterial vasa vasorum or the intraluminal space, with subsequent spread of infection through the intima and outward throu

Q. How are gametes formed in the pteridophyte life cycle, by mitosis or meiosis? What is the type of meiosis that occurs in pteridophytes? In pteridophytes gametes are made by

why do we get severe leg pains when the internal bone is cracked?

DISORDER S OF THE ADRENAL CORTEX - ( i )      ADDISON'S DISEASE : This disease is caused by the deficiency of mineralocorticoids and glucocorticoids. Its symptoms include l

Explain the Sub-clinical Protein Energy Malnutrition? You have already learnt that clinical forms of PEM represent only a small proportion of the total cases of PEM in a commun

Explain Micronutrient deficiencies during kwashiorkor? Almost all the children manifest anaemia (due to iron deficiency) of some degree. Eye signs of vitamin A' deficiency are