Foliose lichen stage - xerarch, Biology

Assignment Help:

Foliose Lichen Stage - Xerarch

As mentioned earlier, the weathering of the rocks and the decaying of the crustose lichens results in the formation of soil on the otherwise bare rocks. The foliose lichens make their appearance on such spots on the rocks which have accumulated some soil. These lichens include Dermatocarpon, Parmelia and Umbilicaria. These lichens have large, leaf-like thalli, which overlap the crustose lichens. The latter are thus cut-off from direct light. This results in death and decay of the crustose lichens.

The mass of foliaceous lichens can absorb and retain more water to some extent. Wind and water-borne dust particles are trapped by these lichens. This helps in the further building up of substratum. All these processes result in the accumulation of more and more humus. The rocks are weathered by the acids secreted by the living and the decaying plants. The weathering of the rocks and the rapid addition of humus to it result in the increase in thickness of soil layer. Thus, a considerable change in habitat is brought about.


Related Discussions:- Foliose lichen stage - xerarch

How do beings of the class reptilia classify\, Concerning the maintenance o...

Concerning the maintenance of body temperature how do beings of the class Reptilia classify? Like fishes and amphibians, beings of the class Reptilia are heterothermic animals

Virus, assignment order

assignment order

Locomotion in arthropoda, Locomotion in Arthropoda The Arthropods are...

Locomotion in Arthropoda The Arthropods are characterized by the existence of some special features which can be considered key to their success. These involve a rigid exoske

Late recurrence of artgirza--recurrence of angina, Late recurrence of a...

Late recurrence of artgirza: This is a reflection of progress of disease in the native coronary arteries distal to the grafts or narrowing or blockage of one or more of the g

Stratification of vegetation - qualitative characters, Stratification of Ve...

Stratification of Vegetation - Qualitative Characters Stratification of vegetation is another important feature of plant communities. There are different vertical strata in di

Compare different communities for conservation purpose, "Diversity is good"...

"Diversity is good" is one of the axioms of conservation biology. However in absentia of historical information, why is noting higher diversity in a system NOT the best way to eval

Gamete formation, During the life cycle of most animals, some diploid cells...

During the life cycle of most animals, some diploid cells undergo meiosis and haploid form in a process called gametogenesis. Spermatogenesis: In the testes of the male, the

Malarial parasites be transmitted from an infected person, By what means ca...

By what means can malarial parasites be transmitted from an infected person to a healthy person?   The malaria parasite is transferred when a healthy person is bitten by a m

Age distribution - population parameters and regulation, Age Distribution -...

Age Distribution - Population Parameters and Regulation It is obvious that individuals in a population will be of different age groups. Relative numbers of young and old indiv

Haccp control point, HACCP Control Point  HACCP Control Point :  Any...

HACCP Control Point  HACCP Control Point :  Any step at which biological, chemical or physical factors can be controlled.

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