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

Rapidly flowing waters - biota of rivers, Rapidly Flowing Waters - Biota of...

Rapidly Flowing Waters - Biota of Rivers In the rapidly flowing section of the river, the water current is the dominant feature. Everything that is not attached or weighed is

Procaryotes to eucaryotes, PROCARYOTES TO EUCARYOTES Procaryotes are th...

PROCARYOTES TO EUCARYOTES Procaryotes are the simple, unicellular organisms which do not have well defined nucleus, whereas eucaryotes are the complex;multicellular organisms w

Human respiratory system - Trachea, TRACHE A - It is a thin walled ...

TRACHE A - It is a thin walled tube. Situated on ventral side. Commonly known as wind pipe. Supported by C-shaped cartilagenous rings. Incomplete dorsally due to oesopha

Nutrients and the soil, Nutrients and the Soil Early experiments on mi...

Nutrients and the Soil Early experiments on mineral uptake were performed by Hoagland, Stout and Amon in 1923. They showed that minerals were taken up from the soil primarily

Biting mechanism of snakes, i want to know the contents which i should writ...

i want to know the contents which i should write in my assignment..related to the above topic..

Explain cancer and inhibition of tumorigenesis, Explain Cancer and Inhibiti...

Explain Cancer and Inhibition of Tumorigenesis? Polyphenols appear to play a preventive role although the molecular mechanisms of action and applicability to human cancer preve

Explain entecavir, Explain Entecavir  Entecavir  (Baraclude) taken ora...

Explain Entecavir  Entecavir  (Baraclude) taken orally once a day as monotherapy appears to be superior to lamivudine for patients with chronic HBV infection, but susceptibili

Pathophysiology of endocrine system, What is the relation between posterior...

What is the relation between posterior pituitary gland and diabetes insipidus?

Cilia and flagella – protozoans, Cilia and Flagella – Protozoans Cilia...

Cilia and Flagella – Protozoans Cilia and flagella basically have a similar structure and distinction between the two on structural basis does not exist. There is a filament o

Genetics, What does skin color in man shows?

What does skin color in man shows?

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