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

Define broken instrument removal procedures, Define Broken Instrument Remov...

Define Broken Instrument Removal Procedures File or reamer Gates-glidden Peso drills Lentulo spiral paste fillers Thermomechanical gutta-percha computer

Auxins - plant growth substances, Auxins - Plant Growth Substances Jul...

Auxins - Plant Growth Substances Julius Sachs (1882) first suggested on the basis of his observations that there are special substances for forming roots and some special subs

What do you mean by nervous system, Q. What do you mean by Nervous System? ...

Q. What do you mean by Nervous System? Structural Organization:   CNS + PNS Functional Organization:   only concerned with PNS Sensory (Afferent) ->  CNS Motor (Effe

Determine net atp production after complete oxidation, How do you determine...

How do you determine net atp production after complete oxidation to CO2 and H2O using mitochondrial?-oxidation, the TCA cycle, the mitochondrial electron transport chain and oxidat

What are steroid hormones , Cholesterol is the precursor of the five major...

Cholesterol is the precursor of the five major classes of steroid hormones.The synthesis of steroid hormones is initiated by the removal of a six-carbon unit  from  carbon  20  of

External sources for health care, Normal 0 false false fals...

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

What is meant by the substrates of enzymatic reactions, Q. What is meant by...

Q. What is meant by the substrates of enzymatic reactions? The Substrates are reagent molecules upon which enzymes act. The enzyme has spatial binding sites for the attachmen

Euglena, Take the prepared slide of Euglena and focus it first under low po...

Take the prepared slide of Euglena and focus it first under low power and next under the high power of tlie microscope. Observe tlie following characteristics: i) Euglena is an

Osmosis, If you have water, 10% sucrose, and 40% sucrose solution. Which so...

If you have water, 10% sucrose, and 40% sucrose solution. Which solutions were isotonic to each other?

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