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

Define translation phase of gene expression process, Define Translation Pha...

Define Translation Phase of gene expression process? The NDA which the transcript into m RNA is translated into protein with the help of ribosomes, m RNA, amino acids, a number

What is pulse rate, Pulse Each time the left ventricle contracts and fo...

Pulse Each time the left ventricle contracts and forces blood into the aorta, it expands to adjust additional blood. And blood already present is pushed to other section and al

Difference between fat-soluble and water-soluble vitamins, Q. What is the d...

Q. What is the difference between fat-soluble and water-soluble vitamins? Why can fat-soluble vitamins cause harm when ingested in excess? Water-soluble vitamins are those vita

Explain effect of irradiation on nutrients, Normal 0 false fa...

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

What are the differences between minerals and ores , Menerals are naturally...

Menerals are naturally occurring inorganic solids with a crystalline structure and a definite range of chemical formula. Ores are concentrations of minerals in rock.

Alternative processing: alternative splicing, Various cases  are  now  know...

Various cases  are  now  known  where  variant  tissues  splice  the  main  RNA transcript of a single gene by instead pathways, where the exons which are lost and those which are

Some precautionary measures to avoid addiction, SOME PRECAUTIONARY MEASURES...

SOME PRECAUTIONARY MEASURES TO AVOID ADDICTION - DEADDICTIO N - First phase of treatment is detoxification. Next phase is of psychotherapy and counselling. Deadi

Define post-surgical nutrition support for chd patient, Define Post-surgica...

Define Post-surgical Nutrition Support for CHD Patient? Nutrition support should be started as soon as possible. If oral not possible, enteral nutrition support should be pr

Explain the functional properties of proteins, Functional properties of pro...

Functional properties of proteins These are those physico-chemical properties that enable the proteins to contribute to the desirable characteristics of the food Potential f

Radioisotope diagnostic procedures, RADIOISOTOPE DIAGNOSTIC PROCEDURE: ...

RADIOISOTOPE DIAGNOSTIC PROCEDURE: Radioisotope diagnostic procedures include perfusion, ventilation  and gallium scan. Perfusion Lung Scan Following  injection of a radio

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