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

Classifications of carbohydrates based on number of carbon, Define the Clas...

Define the Classifications of carbohydrates based on number of carbon?   A chain-form monosaccharide that has a carbonyl group (C= O) on an end carbon forming an aldehy

Explain phosphofiuctokinase-i, Phosphofiuctokinase-I Phosphofiuctokina...

Phosphofiuctokinase-I Phosphofiuctokinase-I  is activated by AMP and  inhibited by ATP and citrate. When ATP is utilized in energy requiring process, the concentration ofAMP

Flowering - development of plant, Flowering - Development of plant One...

Flowering - Development of plant One of the major changes that occur during the life cycle of a plant is the transition from vegetative stage to the flowering stage. In this t

Explain the management strategies congenital heart disease, Explain the Man...

Explain the Management Strategies for Adults with Congenital Heart Disease ? The goals for management of congenital heal disease in adults are improving upon the natural histo

Explain community dietitians, Explain Community dietitians Community d...

Explain Community dietitians Community dietitians or  nutritionists  may  counsel  individuals and  groups on  sound nutrition practices  to  prevent  disease, maintain  healt

Nutritional management goals for atherosclerosis, Q. Nutritional Management...

Q. Nutritional Management Goals for atherosclerosis? The nutritional management goals include: • Reduction of weight if overweight or obese • Reduction in the intake of

Cycles of matter, describe the path of nitrogen through its biogenochemicsa...

describe the path of nitrogen through its biogenochemicsal cycle

Characteristics of the digestive system of earthworm, Q Which are the organ...

Q Which are the organs and characteristics of the digestive system of earthworms related to the kind of diet of these animals? Small organisms ingested together with soil parti

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

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