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

What is katal, What is katal katal : the amount of  enzyme that  tran...

What is katal katal : the amount of  enzyme that  transforms  1 mol  of substrate into product in one second.

Anaplasia - characteristics define cancer, Anaplasia - Characteristics Defi...

Anaplasia - Characteristics Define Cancer Anaplasia is a structural abnormality where cells resemble primitive or embryonic tissue in which adult functions are diminished or t

Fluid management in diarrhoea, Q. Fluid management in Diarrhoea? Fluid ...

Q. Fluid management in Diarrhoea? Fluid management: The key to diarrhoea management is the early replacement of fluid lost in the stools through intravenous or oral route. Whil

Uses of microbes in industry-citric acid, Normal 0 false fals...

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

Excretory system - kidney, Kidney - 2 in number. Dark red. Sl...

Kidney - 2 in number. Dark red. Slightly flattened. Bean shaped. 10 cm. long, 5 cm wide and 4 cm thick (In rabbit 20-25 mm). Weighing 150 gm in male 135 gm in fema

Explain about the cyclamate - artificial sweeteners, Explain about the cycl...

Explain about the cyclamate - artificial sweeteners? Another sweetener is cyclamate (sodium cyclohexylsulphamate). Have a look at its structure as shown in the figure. It is on

Animal pharming, A n i m a l pharming Using animals...

A n i m a l pharming Using animals as bioreactors is also cost-effective and advantageous because animals naturally carry the cellular mechanisms needed to

What is mucoperiosteal flap, What is mucoperiosteal flap Silk is easy t...

What is mucoperiosteal flap Silk is easy to handle, ties with a slip knot, and is relatively inexpensive compared with other nonabsorbable suture materials currently available.

How pathogenic bacteria cause diseases, What are some mechanisms by which p...

What are some mechanisms by which pathogenic bacteria cause diseases? Why is this knowledge important? Pathogenic bacteria have characteristics called as virulence factors that

Explai total fertility rate and replacement level, Differentiate between To...

Differentiate between Total Fertility Rate (TFR) and Replacement Level (RL) Due to uncontrolled excessive hunting the population of tigers in a forest becomes Zero. Discuss the

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