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

Glycolipids, G L YCOLIPIDS They are lipids having sugar residues. ...

G L YCOLIPIDS They are lipids having sugar residues. Two common glycolipids are cerebrosides and gangliosides. (1) Cerebrosides They are made of amino alcohol sphi

How does the presence of exoskeleton, Q How does the presence of exoskeleto...

Q How does the presence of exoskeleton describe the general small size of arthropods? Since they have periodic ecdysis and exoskeleton, the growth of arthropods is limited to a

What organisms make glycogen, What organisms make starch? What is it used f...

What organisms make starch? What is it used for? What organisms make glycogen? What is it used for?

Ecology, why would it be difficult to determine accurate values for the fou...

why would it be difficult to determine accurate values for the four variables in the Lotka-Volterra predator-prey model (a, rprey, m, b) for animals in the real world?

Drawbacks of nutritional status that assessed traditionally, Define drawbac...

Define drawbacks of Nutritional status that assessed traditionally? Nutritional status assessed traditionally with the use of anthropometric, biochemical clinical and dietary a

Determine the muscarinic acetylcholine receptors, Which of the following se...

Which of the following serves as an effector, or as part of an effector, that functions in a negative feedback system? A. Muscarinic Acetylcholine Receptors (mAChRs) in the SA

What is cross contamination, Q. What is cross contamination? Cross cont...

Q. What is cross contamination? Cross contamination is the passage of micro-organisms from one person to another via any route direct or indirect.

Elaborate extracorporial in detail, Elaborate Extracorporial in detail. ...

Elaborate Extracorporial in detail. Outside of the body. An example is extracorporial digestion found in some animals where digestive enzymes are regurgitated into food. Once i

Importance of biodiversity, T hese are some important uses of biodiversity....

T hese are some important uses of biodiversity. 1.   Source of food, medicines and drugs: (a)       Wheat, rice and maize are three carbohydrate rich crops and contribute

Ciliates - parasitic protozoan, Ciliates - Parasitic Protozoan The onl...

Ciliates - Parasitic Protozoan The only ciliate of medical and veterinary importance is Balantidium coli which inhabit the large intestine of man, apes, monkeys and pigs. B. c

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