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

What is tricuspid valve annuloplasty, Q. What is Tricuspid valve annuloplas...

Q. What is Tricuspid valve annuloplasty? It depends upon the cause of tricuspid regurgitation. Specific therapy is directed towards the particular cause of pulmonary artery hyp

Diet for cardiac patients, Diet Continue diet as prescribed at hospita...

Diet Continue diet as prescribed at hospital. Some may continue fluid and salt restriction, some may have to restrict iron and Vitamin K rich food stuff. The patient needs t

In what ways does over-grazing lead to soil erosion, In what ways does over...

In what ways does over-grazing lead to soil erosion? Over-grazing leads to erosion because (i) the animals delete all the vegetation, so exposing the soil to heavy rain, (ii) t

Capillaries - circulation, Normal 0 false false false E...

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

What is echocardiography, Q. What is Echocardiography? Ans. Echoca...

Q. What is Echocardiography? Ans. Echocardiography has become an established and powerful tool for diagnosing presence of CAD and defining its consequence. It can help in

Explain the importance of the auxin, a) How is the milk production regulate...

a) How is the milk production regulated by hormones in human female? Define. b) Explain the importance of the auxin / cytokinin ratio in plant tissue culture.

Neo-zoonoses, Neo-zoonoses In recent times, some of the pre-existing l...

Neo-zoonoses In recent times, some of the pre-existing low profile and less frequent zoonoses and some entirely newly recognized zoonoses are emerging with a new dimension. Th

Explain common concerns during pregnancy, Explain Common Concerns during Pr...

Explain Common Concerns during Pregnancy? Many of the physiological changes that occur during pregnancy affect the digestive tract and may cause discomfort to the mother. Most

Polysaccharides and oligosaccharides, Polysaccharides and Oligosaccharides ...

Polysaccharides and Oligosaccharides are both parts of carbohydrate molecules, but they vary in complexity and size. The Oligosaccharides are much easier and smaller, according to

When does the greatest buffering capacity of weak acids, The greatest buffe...

The greatest buffering capacity of weak acids is when- Select one: a. They are almost completely dissociated b. They are almost completely undissociated c. They are nea

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